Emily Dickinson Lexicon

DIS-SEM'BLE, v.t. [L. dissimulo; dis and simulo, from similis, like; Fr. dissimuler; It. dissimulare; Sp. disimular; Arm. diçzumula.]

1. To hide under a false appearance; to conceal; to disguise; to pretend that not to be which really is; as, I will not dissemble the truth; I can not dissemble my real sentiments. [This is the proper sense of this word.]
2. To pretend that to be which is not; to make a false appearance of. This is the sense of simulate. Your son Lucentio / Doth love my daughter, and she loveth him, / Or both dissemble deeply their affections. – Shak.