tenable

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

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.
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         I would be the last man in the world to give up his
         cause when it was tenable.               --Sir W.
                                                  Scott.
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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