The Collaborative International Dictionary of English v.0.48:

Advisable \Ad*vis"a*ble\, a.
   1. Proper to be advised or to be done; expedient; prudent.
      [1913 Webster]

            Some judge it advisable for a man to account with
            his heart every day.                  --South.
      [1913 Webster]

   2. Ready to receive advice. [R.] --South.
      [1913 Webster]

   Syn: Expedient; proper; desirable; befitting.
        [1913 Webster]

WordNet (r) 3.0 (2006):

advisable
    adj 1: worthy of being recommended or suggested; prudent or
           wise; "such action is neither necessary nor advisable";
           "extreme caution is advisable"; "it is advisable to
           telephone first" [ant: inadvisable, unadvisable]

Moby Thesaurus II by Grady Ward, 1.0:

45 Moby Thesaurus words for "advisable":
   advantageous, appropriate, becoming, befitting, commendable,
   congruous, convenient, decent, desirable, expedient, favorable,
   feasible, felicitous, fit, fitten, fitting, fructuous, good, happy,
   intelligent, judicious, likely, meet, opportune, politic,
   practical, profitable, proper, prudent, recommendable, right,
   seasonable, seemly, sensible, smart, sortable, sound, suitable,
   tactical, timely, to be desired, useful, well-timed, wise,
   worthwhile