Source : Webster's Revised Unabridged Dictionary (1913)

Inappropriate \In`ap*pro"pri*ate\, a.
   Not instrument (to); not appropriate; unbecoming; unsuitable;
   not specially fitted; -- followed by to or for. --
   {In`ap*pro"pri*ate*ly}, adv. -- {In`ap*pro"pri*ate*ness}, n.

Source : WordNet®

inappropriate
     adj 1: not suitable for a particular occasion etc; "noise seems
            inappropriate at a time of sadness"; "inappropriate
            shoes for a walk on the beach"; "put inappropriate
            pressure on them" [ant: {appropriate}]
     2: not conforming with accepted standards of propriety or
        taste; undesirable; "incorrect behavior"; "she was seen in
        all the wrong places"; "He thought it was wrong for her to
        go out to work" [syn: {incorrect}, {wrong}]
     3: not in keeping with what is correct or proper; "completely
        inappropriate behavior" [syn: {incompatible}, {out or
        keeping(p)}, {unfitting}]