The Collaborative International Dictionary of English v.0.48:

Assumed \As*sumed"\, a.
   1. Supposed.
      [1913 Webster]

   2. Pretended; hypocritical; make-believe; as, an assumed
      character.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Assume \As*sume"\, v. t. [imp. & p. p. Assumed; p. pr. & vb.
   n. Assuming.] [L. assumere; ad + sumere to take; sub +
   emere to take, buy: cf. F. assumer. See Redeem.]
   1. To take to or upon one's self; to take formally and
      demonstratively; sometimes, to appropriate or take
      unjustly.
      [1913 Webster]

            Trembling they stand while Jove assumes the throne.
                                                  --Pope.
      [1913 Webster]

            The god assumed his native form again. --Pope.
      [1913 Webster]

   2. To take for granted, or without proof; to suppose as a
      fact; to suppose or take arbitrarily or tentatively.
      [1913 Webster]

            The consequences of assumed principles. --Whewell.
      [1913 Webster]

   3. To pretend to possess; to take in appearance.
      [1913 Webster]

            Ambition assuming the mask of religion. --Porteus.
      [1913 Webster]

            Assume a virtue, if you have it not.  --Shak.
      [1913 Webster]

   4. To receive or adopt.
      [1913 Webster]

            The sixth was a young knight of lesser renown and
            lower rank, assumed into that honorable company.
                                                  --Sir W.
                                                  Scott.
      [1913 Webster]

   Syn: To arrogate; usurp; appropriate.
        [1913 Webster]

WordNet (r) 3.0 (2006):

assumed
    adj 1: adopted in order to deceive; "an assumed name"; "an
           assumed cheerfulness"; "a fictitious address"; "fictive
           sympathy"; "a pretended interest"; "a put-on childish
           voice"; "sham modesty" [syn: assumed, false,
           fictitious, fictive, pretended, put on, sham]

Moby Thesaurus II by Grady Ward, 1.0:

108 Moby Thesaurus words for "assumed":
   accepted, accounted as, affected, alleged, apocryphal, artificial,
   assumptive, bastard, bogus, brummagem, chanced, colorable, colored,
   conjectured, counterfeit, counterfeited, deceptive, deemed,
   delusory, distorted, dressed up, dummy, embellished, embroidered,
   ersatz, expected, expropriated, factitious, fake, faked, false,
   falsified, feigned, fictitious, fictive, garbled, given, granted,
   hinted, hypocritical, hypothetical, illegitimate, illusory,
   imitation, implicated, implied, in hand, in process, in progress,
   in the works, indicated, inferred, insubstantial, intimated,
   involved, junky, made-up, make-believe, man-made, meant, mock,
   on the anvil, perverted, phony, pinchbeck, postulated,
   postulational, premised, presumed, presumptive, presupposed,
   pretended, pseudo, put on, put-on, putative, quasi, queer, reputed,
   seized, self-styled, sham, shoddy, simulated, so-called,
   soi-disant, spurious, suggested, supposed, suppositional,
   supposititious, suppositive, synthetic, taken, taken for granted,
   theoretical, tin, tinsel, titivated, twisted, unauthentic,
   under way, understood, undertaken, ungenuine, unnatural, unreal,
   warped