groundless

[ground-lis] / ˈgraʊnd lɪs /

ADJECTIVE

without reason, justification

Synonyms

STRONGEST

baseless false flimsy gratuitous illogical illusory unfounded unjustified unsupported unwarranted

WEAK

bottomless causeless chimerical empty foundationless idle imaginary unauthorized uncalled-for unprovoked

Antonyms

STRONGEST

correct genuine justified real reasonable right substantiated warranted

WEAK

called-for grounded proven

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

“The impact on the bookings has been quite hard,” said Patel, who called the lawsuit groundless.

From The Wall Street Journal • Nov. 20, 2025

Beijing at the time called the accusations "groundless".

From Barron's • Oct. 19, 2025

"But all these claims are groundless and without proof."

From BBC • Sep. 24, 2025

Lot of reasons for that, it’s not groundless optimism.

From Salon • Aug. 5, 2025

My fears were groundless, there was nothing to it.

From "Invisible Man" by Ralph Ellison