adjective
- without foundation; not based on fact, realistic considerations, or the like: unfounded suspicions.
- not established; not founded: the prophet of a religion as yet unfounded.
adjective
- (of ideas, allegations, etc) baseless; groundless
- not yet founded or established
1640s, “having no foundation or basis,” from un- (1) “not” + past participle of found (v.1).