The Collaborative International Dictionary of English v.0.48:

Dissembling \Dis*sem"bling\, a.
   That dissembles; hypocritical; false. -- Dis*sem"bling*ly,
   adv.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Dissemble \Dis*sem"ble\, v. t. [imp. & p. p. Dissembled; p.
   pr. & vb. n. Dissembling.] [OF. dissembler to be
   dissimilar; pref. dis- (L. dis-) + F. sembler to seem, L.
   simulare to simulate; cf. L. dissimulare to dissemble. See
   Simulate, and cf. 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.
      [1913 Webster]

            Dissemble all your griefs and discontents. --Shak.
      [1913 Webster]

            Perhaps it was right to dissemble your love,
            But -- why did you kick me down stairs? --J. P.
                                                  Kemble.
      [1913 Webster]

   2. To put on the semblance of; to make pretense of; to
      simulate; to feign.
      [1913 Webster]

            He soon dissembled a sleep.           --Tatler.

   Syn: To conceal; disguise; cloak; cover; equivocate. See
        Conceal.
        [1913 Webster]

WordNet (r) 3.0 (2006):

dissembling
    n 1: pretending with intention to deceive [syn: pretense,
         pretence, feigning, dissembling]
    2: the act of deceiving [syn: deception, deceit,
       dissembling, dissimulation]