Synonyms of undesirable in English:

undesirable


See definition of undesirable

adjective

1‘a mix of medicines may result in undesirable side effects’

SYNONYMS
unpleasant, disagreeable, nasty, unacceptable, unwelcome, unwanted, unwished-for, unenviable, unappealing
unfortunate, infelicitous
ANTONYMS

desirable, pleasant, preferable

2‘William had been involved with some very undesirable people’

SYNONYMS
unpleasant, disagreeable, distasteful, displeasing, unacceptable, off-putting, obnoxious
nasty, disgusting, awful, terrible, dreadful, frightful, repulsive, repellent, repugnant, revolting, abhorrent, loathsome, hateful, detestable, reprehensible, deplorable, appalling, insufferable, intolerable, despicable, contemptible, beyond the pale, odious, vile, obscene, foul, unsavoury, unpalatable, sickening, nauseating, nauseous, noxious
informal ghastly, horrible, horrid
British informal beastly
archaic disgustful, loathly
rare exceptionable, rebarbative
ANTONYMS

pleasant, agreeable, acceptable