Synonyms:
baseless, groundless, idle, unfounded, unwarranted, wild
Meaning: without a basis in reason or fact; "baseless gossip"; "the allegations proved groundless"; "idle fears"; "unfounded suspicions"; "unwarranted jealousy"
Usage examples
But these assurances of the priests proved, unfortunately for the poor Guards, to be entirely unfounded.
So I reasoned with myself in the morning, and I tell you the direction of my suspicions, however much the result may have shown that they were unfounded.
There are many other unfounded ideas current among the rest of the Hellenes, even on matters of contemporary history, which have not been obscured by time.