The Collaborative International Dictionary of English v.0.48:

Inapplicable \In*ap"pli*ca*ble\, a. [Pref. in- not +
   applicable.]
   Not applicable; incapable of being applied; not adapted; not
   suitable; as, the argument is inapplicable to the case. --J.
   S. Mill.

   Syn: Unsuitable; unsuited; unadapted; inappropriate;
        inapposite; irrelevant. -- In*ap"pli*ca*ble*ness, n.
        -- In*ap"pli*ca*bly, adv.
        [1913 Webster]

WordNet (r) 3.0 (2006):

inapplicable
    adj 1: not capable of being applied; "rules inapplicable to day
           students" [syn: inapplicable, unsuitable]