The Collaborative International Dictionary of English v.0.48:

Mannish \Man"nish\, a. [Man + -ish: cf. AS. mennisc, menisc.]
   1. Resembling a human being in form or nature; human.
      --Chaucer.
      [1913 Webster]

            But yet it was a figure
            Most like to mannish creature.        --Gower.
      [1913 Webster]

   2. Resembling, suitable to, or characteristic of, a man,
      manlike, masculine. --Chaucer.
      [1913 Webster]

            A woman impudent and mannish grown.   --Shak.
      [1913 Webster]

   3. Fond of men; -- said of a woman. [Obs.] --Chaucer.
      [1913 Webster] -- Man"nish*ly,adv. -- Man"nish*ness,
      n.
      [1913 Webster]

WordNet (r) 3.0 (2006):

mannish
    adj 1: resembling or imitative of or suggestive of a man rather
           than a woman; "a mannish stride"
    2: characteristic of a man as distinguished from a woman; "true
       mannish arrogance"

Moby Thesaurus II by Grady Ward, 1.0:

33 Moby Thesaurus words for "mannish":
   AC-DC, amphierotic, andric, autoerotic, bisexed, bisexual, bull,
   butch, deviant, effeminate, gay, gentlemanlike, gentlemanly,
   homoerotic, homosexual, hoyden, lesbian, male, manful, manlike,
   manly, mannified, masculine, perverted, queer, rompish, sapphic,
   tomboyish, transvestite, tribadistic, uneffeminate, unfeminine,
   viraginous