Etymology
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dissemble (v.)

early 15c., dissemblen, "assume a false seeming; conceal real facts, motives, intentions, etc.; mask the truth about oneself," from Old French dessembler, from Latin dissimulare "make unlike, conceal, disguise," from dis- "completely" (see dis-) + simulare "to make like, imitate, copy, represent," from stem of similis "like, resembling, of the same kind" (see similar). Related: Dissembled; dissembling.

Form altered apparently by influence of resemble, Old French resembler. Earlier was Middle English dissimule, from Old French dissimuler. Transitive meaning "make unlike, disguise" is from c. 1500; that of "give a false impression of" is from 1510s.

To dissemble is to pretend that a thing which is is not: as, to dissemble one's real sentiments. To simulate is to pretend that a thing which is not is: as, to simulate friendship. To dissimulate is to hide the reality or truth of something under a diverse contrary appearance: as, to dissimulate one's poverty by ostentation. To disguise is to put under a false guise, to keep a thing from being recognized by giving it a false appearance: as I cannot disguise from myself the fact. [Century Dictionary]

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Definitions of dissemble

dissemble (v.)
make believe with the intent to deceive;
Synonyms: feign / sham / pretend / affect
dissemble (v.)
hide under a false appearance;
Synonyms: cloak / mask
dissemble (v.)
behave unnaturally or affectedly;
Synonyms: pretend / act
From wordnet.princeton.edu