groundless

Definitions

Not based on any good reason or evidence; unjustified.

Having no foundation or basis in fact.

Examples

The rumors about the company's bankruptcy turned out to be completely groundless.

She felt that his accusations were groundless and lacked any supporting evidence.

The fear that the project would fail proved to be groundless once the results were published.

Synonyms

baseless unfounded unsubstantiated unjustified gratuitous unwarranted unsupported

Antonyms

well-founded justified substantiated proven valid reasonable supported