The Collaborative International Dictionary of English v.0.48:

Incommodious \In`com*mo"di*ous\, a. [Pref. in- not + commodious:
   cf. LL. incommodious, L. incommodus, F. incommode.]
   Tending to incommode; not commodious; not affording ease or
   advantage; unsuitable; giving trouble; inconvenient;
   annoying; as, an incommodious seat; an incommodious
   arrangement. -- In`com*mo"di*ous*ly, adv. --
   In`com*mo"di*ous*ness, n.
   [1913 Webster]

WordNet (r) 3.0 (2006):

incommodious
    adj 1: uncomfortably or inconveniently small; "incommodious
           hotel accommodations" [ant: commodious, convenient]

Moby Thesaurus II by Grady Ward, 1.0:

33 Moby Thesaurus words for "incommodious":
   angustifoliate, angustirostrate, angustisellate, angustiseptal,
   awkward, circumscribed, close, close-fitting, clumsy, confined,
   constricted, cramp, cramped, crowded, discommodious, incapacious,
   inconvenient, isthmian, isthmic, limited, meager, narrow, near,
   restrained, restricted, scant, scanty, slender, strait, tight,
   troublesome, unhandy, unwieldy