inappropriate

Synonyms: bad form disproportionate foot-in-mouth garbage ill-fitted ill-suited ill-timed improper inapplicable inapropos incongruous inconsonant incorrect indecorous inept irrelevant left-field malapropos off out of line out of place tasteless unbecoming unbefitting undue unfit unfitting unmeet unseasonable unseemly unsuitable untimely way off wrong wrong-number

Antonyms: appropriate fitting ok proper suitable