adj. 25B6; adjective
an unbecoming sundress : UNFLATTERING, unattractive, unsightly, plain, ugly, hideous; unsuitable.
conduct unbecoming to the Senate : INAPPROPRIATE, unfitting, unbefitting, unsuitable, unsuited, inapt, out of keeping, untoward, incorrect, unacceptable; unworthy, improper, unseemly, undignified.
flattering, appropriate.