GROUNDLESS Synonyms: 92 Similar and Opposite Words

groundless

adjective

ˈgrau̇n(d)-ləs

Definition of groundless

as in unreasonable

having no basis in reason or fact please stop making groundless accusations against innocent people fears of a strike proved groundless

Synonyms & Similar Words

Relevance

Antonyms & Near Antonyms

Example Sentences

Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.

Recent Examples of groundless Lawmakers, judges and other public servants, all under groundless presidential attack. — James D. Zirin, Washington Post, 3 Feb. 2026 Similarly, the course of action that will bring recovery—reviving domestic manufacturing, revitalizing small towns, ensuring fairness for farmers and working people—is not an impossibility that will poison our minds with groundless optimism. — Rosa Lyster, Harpers Magazine, 30 Dec. 2025 Secretary Kennedy’s team seeks to make autism compensable under vaccine-injury rules, turning diagnoses into groundless lawsuits while draining resources from real causes and care. — Tom Frieden, Scientific American, 21 Nov. 2025 Earlier this week, Sulton said the new criminal case is groundless and accused prosecutors of bringing additional charges because Spencer rejected a plea deal on the first case. — Vanessa Swales, jsonline.com, 17 Oct. 2025 See All Example Sentences for groundless

Recent Examples of Synonyms for groundless

Adjective

The parties have blamed each other for trying to make unreasonable last-minute changes to their agreement.

— Kevin Breuninger,Michael Wayland, CNBC, 24 Aug. 2026
The investigation found Brazilian policies unreasonable or discriminatory toward US commerce.

— Joshua Hong, Fortune, 21 Aug. 2026

Definition of unreasonable

Adjective

Towers said that concerns about consent and explanation of risk are baseless.

— Amy Yurkanin, ProPublica, 24 Aug. 2026
And Democratic aides in Washington are preparing members of Congress to push back in the court of public opinion against any baseless claims of voter fraud in competitive districts.

— Kevin Rector, Los Angeles Times, 23 Aug. 2026

Definition of baseless

Browse Nearby Words

groundings

groundless

groundling

See all Nearby Words

Cite this Entry

Style

“Groundless.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/groundless. Accessed 1 Sep. 2026.

Copy Citation

Synonyms of groundless

adjective

Example Sentences

Browse Nearby Words

Cite this Entry

More from Merriam-Webster

Word of the Day

conscientious

Popular in Grammar & Usage

A Who’s Who Regarding ‘Who’s’ and ‘Whose’

Is it 'nerve-racking' or 'nerve-wracking'?

What's the difference between 'fascism' and 'socialism'?

Why does English have so many silent letters?

7 Pairs of Commonly Confused Words

Popular in Wordplay

Ye Olde Nincompoop: Old-Fashioned Words for 'Stupid'

14 Phobias You Probably Haven't Heard Of

Even More Words That Sound Like Insults But Aren't

Even More Bird Names that Sound Like Insults (and Sometimes Are)

12 Lovely and Unusual Words for the Natural World

Popular

A Who’s Who Regarding ‘Who’s’ and ‘Whose’

Ye Olde Nincompoop: Old-Fashioned Words for 'Stupid'

14 Phobias You Probably Haven't Heard Of

Games & Quizzes