Adjective undesirable has 2 senses
- undesirable - not desirable; "undesirable impurities in steel"; "legislation excluding undesirable aliens"
Antonyms: desirable, coveted, desired, in demand, sought after, delectable, sexually attractive, enviable, plummy, preferable, preferred
- undesirable, unsuitable - not worthy of being chosen (especially as a spouse)
Antonym: eligible (indirect, via ineligible)
,Noun undesirable has 1 sense
- undesirable - one whose presence is undesirable; "rounding up vagrants and drunks and other undesirables"
--1 is a kind of unwelcome person, persona non grata