Unfounded

Origin

- + founded

Full definition of unfounded

Adjective

1. Having no strong foundation; not based on solid reasons or facts.
2. Not having been founded or instituted.
• 1980, Helen Louise Gardner, ‎John Carey, English Renaissance studies (page 268)Even the great world as yet undiscovered, the cities as yet unfounded, and the history as yet unwritten, are lost: fallen from the beginning.

Synonyms

• (not based on solid reasons or facts) baseless, groundless, ungrounded