Same word as unapt:

abnormal, at odds, awkward, bad form, discordant, discrepant, erroneous, false, ill-advised, ill-timed, imprudent, inaccurate, inadmissible, inadvisable, inapplicable, inapposite, inappropriate, inapt, incongruous, incorrect, inept, inexpedient, infelicitous, inharmonious, inopportune, irregular, ludicrous, malapropos, odd, off-base, out of place, out-of-place, out-of-season, preposterous, unbecoming, unbefitting, uncalled-for, uncomely, undue, unfit, unfitting, unseasonable, unseemly, unsuitable, unsuited, untimely, unwarranted, wrong