inadequate, improper, malapropos, disagreeable, discordant, incongruous, inharmonious, incompatible, clashing, out of place, jarring, dissonant, discrepant, irrelevant, uncalled-for, dissident, inappropriate, inapt, ill-suited, unseemly, conflicting, opposite, contrary, unbecoming, unfitting, unfit, disparate, disturbing, mismatched, unapt, ill-assorted, disproportionate, divergent, mismated, unmated, inapplicable, inconformable, unassimilable, inconsistent, intrusive, infelicitious, amiss, interfering, disagreeing, uncongenial, inept, unbefitting, inapposite, inadmissible, absurd, senseless, unseasonable, unfortunate, ill-timed, unsympathetic, not in keeping, out of joint, at odds, at variance, repugnant, out of kilter*, cockeyed*.
Antonyms fit*, suitable, proper.