unsuitable

Synonyms: clashing disagreeable discordant discrepant disparate disproportionate dissident dissonant ill-suited improper inadequate inadmissible inapposite inapt incompatible incongruous inconsistent ineligible infelicitous inharmonious interfering irrelevant jarring malapropos out of character out of keeping out of place senseless unacceptable unbecoming unbefitting uncalled-for undue unfit unfitting unmatched unseasonable unseemly unsuited

Antonyms: appropriate proper suitable