The Collaborative International Dictionary of English v.0.48:

Inexpedient \In`ex*pe"di*ent\, a.
   Not expedient; not tending to promote a purpose; not tending
   to the end desired; inadvisable; unfit; improper; unsuitable
   to time and place; as, what is expedient at one time may be
   inexpedient at another.
   [1913 Webster]

         If it was not unlawful, yet it was highly inexpedient
         to use those ceremonies.                 --Bp. Burnet.

   Syn: Unwise; impolitic; imprudent; indiscreet; unprofitable;
        inadvisable; disadvantageous.
        [1913 Webster]

WordNet (r) 3.0 (2006):

inexpedient
    adj 1: not suitable or advisable; "an inexpedient tactic" [ant:
           expedient]
    2: not appropriate to the purpose [syn: inexpedient, unwise]

The Devil's Dictionary (1881-1906):

INEXPEDIENT, adj.  Not calculated to advance one's interests.