say it: uhn-di-ZAHY-ruh-buhl
undesirable is an adjective and noun meaning "not wanted". It carries 3 recorded senses.
not wanted
“undesirable impurities in steel”
“legislation excluding undesirable aliens”
“removed the unwanted vegetation”
not worthy of being chosen (especially as a spouse)
one whose presence is undesirable
“rounding up vagrants and drunks and other undesirables”
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for undesirable come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.