dissemble, dissembled, dissembling, dissembles.verbs
transitive verb senses.to hide; to get away from something; to disguise or conceal under a false appearance; to put on the appearance of; simulate; feign; when people dissemble, they hide their real intentions or emotions (he was not slow to dissemble when it served his purposes; his dissembling enabled him to gain the confidence of the group so that he could begin to divide them, leading to control of them for selfish purposes)
intransitive verb senses.to put on a false appearance; to disguise or conceal one's real nature, motives or feelings behind a false appearance; conceal facts, intentions or feelings under some pretense; a dissimulator
dissembler.noun,.plural.dissemblers
dissemblance.noun,.plural.dissemblances
dissimulation; duplicity
dissemblingly.adverb

disassemble, disassembled, disassembling, disassembles.verbs
transitive verb use.to take apart (disassemble a toaster)
intransitive verb use.to come apart (the units from IKEA disassemble easily; the spectators began to disassemble)
disassembly.noun,.plural.disassemblies

disseminate, disseminated, disseminating, disseminates.verbs-
transitive verb use.to scatter widely, as in sowing seed; to spread abroad; promulgate (disseminate information); to spread abroad as though sowing seed (disseminate ideas); to disperse. throughout
intransitive verb use.to become diffused; spread
dissemination, disseminator(s).nouns
disseminated.adjective
widely dispersed

dissent.intransitive verb
to withhold assent; to differ in opinion or feeling
difference of opinion or dissenting opinion
dissent, dissented, dissenting, dissents.intransitive verbs
to differ in opinion or feeling; disagree; to withhold assent or approval
dissent.noun,.plural.dissents
difference of opinion or feeling; disagreement; nonconformity
dissentingly.adverb
dissenter.noun,.plural.dissenters
one who dissents (political dissenters)
dissentious.adjective
characterized by dissension or dissent; divisive; factious

dissension.noun,.plural.dissensions
disagreement; contentious-quarreling; discord

dissident.adjective
disagreeing, as in opinion or belief
dissident.noun,.plural.dissidents
one who disagrees; a dissenter

dissidence.noun,.plural.dissidences
disagreement, as of opinion or belief; dissent

dissertate.intransitive verb
to discuss formally

dissertation.noun
a formal or lengthy discussion in speech or writing; an extended usually written treatment of a subject
dissertational.adjective

dissimulation.noun,.plural.dissimulations
dissimulator.noun,.plural.dissimulators
to hide one's feelings by pretense or deception
dissimulate.transitive-and.intransitive verb
not like the real self; not sincere; hypocrisy
dissimulate, dissimulated, dissimulating, dissimulates.verbs
transitive verb senses.to disguise (one's intentions, for example) under a feigned appearance
intransitive verb senses.to conceal one's true feelings or intentions
dissimulative.adjective

dissipate, dissipated, dissipating, dissipates.verbs
transitive verb senses.to break up and drive off (as a crowd); to drive away; disperse; scatter; to cause to spread thin or scatter and gradually vanish (the rain has dissipated); to attenuate to or almost to the point of disappearing (the wind finally dissipated the smoke; to lose (as heat or electricity); irrecoverably; to spend or use up wastefully or foolishly (lifelong tendency to dissipate his gifts in travel and pleasure; his fortune is dissipated in imprudent political adventures) 
intransitive verb senses.to break up and scatter or vanish; to be extravagant or dissolute in the pursuit of pleasure; especially; to drink to excess
dissipater.or.dissipator.noun
dissipation.noun
the act of dissipating or the condition of having been dissipated; wasteful expenditure or consumption; dissolute.indulgence in sensual pleasure; intemperance
dissipative.adjective

dissolution.noun
a dissolving or being dissolved; breaking up into parts; an ending; termination; decomposition into fragments or parts; disintegration

dissolute.adjective
lacking moral restraint; indulging in sensual pleasures or vices
dissolutely.adverb
dissoluteness.noun

dissonance.noun
a harsh, disagreeable combination of sounds; discord; lack of agreement, consistency or harmony; conflict; a combination of musical tones conventionally considered to suggest unrelieved tension and require resolution

dissonant.adjective
harsh and inharmonious in sound; discordant.adjective
being at variance; disagreeing
dissonantly.adverb
Music:.constituting or producing a dissonance

dissuade, dissuaded, dissuading, dissuades.transitive verb
to deter (a person) from a course of action or a purpose by persuasion
dissuader.noun
dissuasion.noun
the act or an instance of dissuading
dissuasive.adjective
dissuasively.adverb
dissuasiveness.noun
synonyms.deter, discourage

distemper.noun
a disordered or abnormal bodily state especially of quadruped mammals; as a highly contagious virus disease especially of dogs marked by fever, leukopenia and respiratory, gastrointestinal and neurological symptoms

distend, distended, distending, distends.verbs
to expand from internal pressure; to extend; dilate

distinct.adjective
clearly marked off; not alike; not average; separate; individual; discrete
distinction, distinctness.nouns
distinctly.adverb

distinctive.adjective
serving to identify; distinguishing.(distinctive tattoos); characteristic or typical.(Calgary has a distinctive western flavor); distinctive indicates.qualities distinguishing and uncommon and often superior or praiseworthy (a distinctive aura.{atmosphere} of grace and elegance); differentiating between or among things different, peculiar
distinctively.adverb
distinctiveness.noun

distinction.noun,.plural.distinctions
the act of distinguishing; differentiation; the condition or fact of being dissimilar or distinct; difference; a distinguishing factor, attribute or characteristic; excellence or eminence, as of performance, character or reputation

distinguish, distinguished, distinguishing, distinguishes.transitive verbs
to make noticeable or different; to separate or mark off by differences, set apart; differentiate; to perceive as being different or distinct; to perceive distinctly; discern-(distinguished the masts of ships on the horizon); to cause oneself to be eminent or recognized (they have distinguished themselves as dedicated social workers; he was distinguished for his corruptness, as was ancient king Ahaz)
distinguishably.adverb
intransitive senses-to perceive or indicate differences; discriminate.(distinguish between comfort and discomfort)
distinguished-adjective
noticeable as eminent; celebrated
distinguishable.adjective
that can be distinguished

distort, distorted, distorting, distorts.transitive verbs
to alter the normal aspect of; contort (to twist.facts in such a way as to provide.undeserving.credit (example); to alter or distort the true meaning of; to twist out of shape; change the appearance of; misrepresent; misshape; misstate; pervert
distortion.noun,.plural.distortions
distorter.noun,.plural.distorters

divulge, divulged, divulging, divulges-transitive verbs
to make known (something private or secret); reveal
divulgence, divulger.noun

digit.noun,.plural.digits
one of the ten Arabic numerical symbols 1, 2, 3, 4, 5, 6, 7, 8, 9, or 0; a human finger or toe

digital.adjective
of, relating to or resembling a digit, especially a finger; operated or done with the fingers (a digital switch); having digits; expressed in digits, especially for use by a computer; using or giving a reading in digits (a digital readout on a clock)
digital.noun
a key played with the finger, as on a piano
digitally.adverb
Computers:.a computer that performs calculations and logical operations with quantities represented as digits, usually in the binary number system; compare analog

debilitate, debilitated, debilitating, debilitates.transitive verbs
to sap the strength or energy of; enervate
debilitative.adjective
debilitation.noun,.plural.debilitations

desist, desisted, desisting, desists.intransitive verbs
to cease doing something; forbear; stop; to bring to a standstill; abandon; abolish; abort; abrogate; annul; cancel; cut; drop; eliminate; end; halt; quash; quit; scratch; scrub; shutdown;  suspend; terminate; call off

droll.adjective.comparative.and.superlative forms.droller; drollest
having an odd and amusing quality (a droll little man with a peculiar sense of humor, a book of droll stories)

dwindle, dwindled, dwindling, dwindles.verbs
intransitive verb use.to become gradually less until little remains
transitive verb use.to cause to dwindle; decrease

demented.adjective
mentally ill; insane; suffering from dementia
dementedly.adverb
dementedness.noun
dement, demented, dementing, dements.transitive verbs
to make insane
dementia.noun
deterioration of intellectual faculties, such as memory, concentration and judgment, resulting from a disease or a disorder of the brain; it is often accompanied by emotional disturbance and personality changes; madness; insanity
demential.adjective

dementia praecox.noun.called also schizophrenia