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]

Moby Thesaurus II by Grady Ward, 1.0:

103 Moby Thesaurus words for "inexpedient":
   bad, black, criminal, evil, futile, ill, ill-advised,
   ill-considered, ill-contrived, ill-devised, ill-gauged, ill-judged,
   ill-seasoned, ill-suited, ill-timed, impolitic, improper,
   imprudent, inaccurate, inadvisable, inappropriate, inapt,
   inauspicious, incongruous, inconsiderate, inconvenient, indiscreet,
   inept, infelicitous, inferior, injudicious, inopportune, insensate,
   intempestive, intrusive, invalid, irrational, irrelevant, late,
   mal a propos, malapropos, malevolent, mindless, misadvised,
   misguided, mistimed, myopic, off base, out of line, out of phase,
   out of place, out of time, peccant, premature, reasonless,
   reckless, senseless, shortsighted, sinful, sinister, thoughtless,
   too late, too soon, unadvised, unbefitting, unconsidered,
   undesirable, undiscerning, unfavorable, unfit, unfitting,
   unforeseeing, unfortunate, unhandy, unhappy, unhealthy, unkind,
   unlucky, unmeet, unpleasant, unprofitable, unpropitious, unready,
   unreasonable, unreflecting, unreflective, unripe, unseasonable,
   unseeing, unseemly, unsensible, unskillful, unsound, unsuitable,
   unthinking, unthoughtful, untimely, untoward, unwise, vicious,
   wicked, witless, wrong



The Devil's Dictionary (1881-1906):

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