unfounded

adjective

un·​found·​ed ˌən-ˈfau̇n-dəd 

: lacking a sound basis : groundless, unwarranted

an unfounded accusation

Synonyms of unfounded

• unreasonable
• baseless
• groundless
• unsubstantiated
• unwarranted

Examples of unfounded in a Sentence

the accusation proved to be unfounded

Recent Examples on the Web

The two got married in April, CBS reported, and Danis also became the subject of unfounded conspiracy theories alongside her new husband. — Rebekah Riess, CNN Money, 21 Sep. 2026

Fox's attorneys noted that Rupert Murdoch had been auto-deleting all of his text messages until about April 2022, which was after Dominion had filed its lawsuit against Fox for broadcasting unfounded conspiracy theories about the 2020 election. — Maddy Lauria, NPR, 20 Sep. 2026

Jensen Huang, the CEO of Nvidia, dismissed AI doomsday scenarios as totally unfounded. — Los Angeles Times, 14 Sep. 2026

In a statement Friday, a spokesperson said the allegations are unfounded and noted that the company prevailed at the trial court level. — Jeff McDonald, San Diego Union-Tribune, 12 Sep. 2026

Word History

First Known Use

1648, in the meaning defined above

Rhymes for unfounded

• abounded
• astounded
• compounded
• confounded
• expounded
• foregrounded
• impounded
• propounded
• rebounded
• resounded
• subrounded
• surrounded

Kids Definition

unfounded

adjective

un·​found·​ed ˌən-ˈfau̇n-dəd 

ˈən-

: lacking a sound base : groundless

unfounded suspicions