The DICT Development Group

  Tenable \Ten"a*ble\ (t[e^]n"[.a]*b'l), a. [F. tenable, fr. tenir
     to hold, L. tenere. See Thin, and cf. Continue,
     Continent, Entertain, Maintain, Tenant, Tent.]
     Capable of being held, maintained, or defended, as against an
     assailant or objector, or against attempts to take or
     process; as, a tenable fortress, a tenable argument.
     [1913 Webster]
  
           If you have hitherto concealed his sight,
           Let it be tenable in your silence still. --Shak.
     [1913 Webster]
  
           I would be the last man in the world to give up his
           cause when it was tenable.               --Sir W.
                                                    Scott.
     [1913 Webster]

  tenable
      adj 1: based on sound reasoning or evidence; "well-founded
             suspicions" [syn: tenable, well-founded]

  42 Moby Thesaurus words for "tenable":
     OK, acceptable, admissible, agreeable, all right, alright,
     arguable, believable, colorable, conceivable, condonable, credible,
     creditable, defendable, defensible, excusable, fiduciary,
     good enough, imaginable, impregnable, justifiable, maintainable,
     okay, passable, plausible, possible, rational, reasonable,
     reliable, secure, supportable, trustworthy, trusty,
     unexceptionable, unimpeachable, unobjectionable, unquestionable,
     viable, vindicable, warrantable, workable, worthy of faith