I. “+ adjective
Etymology: un- (I) + desirable
: not desirable : unwanted , objectionable
undesirable impurities in steel
led astray by undesirable companions
legislation excluding undesirable aliens
• un·de·sir·able·ness noun
• un·desirably “+ adverb
II. noun
: one that is undesirable
rounding up vagrants, drunks, undesirables