unfounded

adjective

un·​found·​ed ˌən-ˈfau̇n-dəd 

: lacking a sound basis : groundless, unwarranted

an unfounded accusation

Synonyms of unfounded

• unreasonable
• baseless
• groundless
• unsubstantiated

Examples of unfounded in a Sentence

the accusation proved to be unfounded

Recent Examples on the Web

The spokesperson added that FlightAware’s claim the company could not use its data was unfounded since the information is in the public domain. — Jeff John Roberts, Fortune, 16 July 2026

Anthony Volpe had to defend his character after the team’s play-by-play man, Michael Kay, retracted unfounded claims about the shortdtop’s unwillingness to play second base. — Gary Phillips, New York Daily News, 13 July 2026

But the governor’s office maintained that activist concerns were unfounded. — Haley Parsley, Sacbee.com, 13 July 2026

Police said the majority of the unfounded alerts were fireworks. — N'dea Yancey-Bragg, USA Today, 11 July 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