Webster's Revised Unabridged Dictionary · 1913

Dissemble

Dissemble , transitive verb

[Old French dissembler to be dissimilar; pref. dis- (Latin dis-) + French sembler to seem, Latin simulare to simulate; compare Latin dissimulare to dissemble. See Simulate, and compare Dissimulate.]

1.
To hide under a false semblance or seeming; to feign (something) not to be what it really is; to put an untrue appearance upon; to disguise; to mask.
Dissemble all your griefs and discontents. — Shakespeare
Perhaps it was right to dissemble your love, But -- why did you kick me down stairs? — J. P. Kemble
2.
To put on the semblance of; to make pretense of; to simulate; to feign.
He soon dissembled a sleep. — Tatler

Dissemble , intransitive verb

To conceal the real fact, motives, intention, or sentiments, under some pretense; to assume a false appearance; to act the hypocrite.
He that hateth dissembleth with his lips. — Bible (KJV) - Proverb xxvi. 24
He [an enemy] dissembles when he assumes an air of friendship. — C. J. Smith