undesirable

nouns

one whose presence is undesirable

"rounding up vagrants and drunks and other undesirables"

undesirable

is a type of (narrower)

a person who for some reason is not wanted or welcome

not wanted

"undesirable impurities in steel"; "legislation excluding undesirable aliens";"removed the unwanted vegetation"

undesirable, unwanted

is derived from

antonym

not worthy of being chosen (especially as a spouse)

undesirable, unsuitable

is derived from