adjective
- not desirable or attractive; objectionable: undesirable qualities.
noun
- a person or thing considered undesirable: a collection of malcontents and undesirables.
adjective
- not desirable or pleasant; objectionable
noun
- a person or thing that is considered undesirable
adj.1660s, “not to be desired, objectionable,” from un- (1) “not” + desirable. The noun meaning “undesirable person or thing” is first attested 1883. Undesired “not asked or invited” is recorded from late 15c.