untruth

noun

un·​truth ˌən-ˈtrüth 

ˈən-ˌtrüth

1

archaic : disloyalty

2

: lack of truthfulness : falsity

3

: something that is untrue : falsehood

Synonyms of untruth

• delusion
• myth
• illusion
• error

Examples of untruth in a Sentence

the untruths he has uttered

their argument rests on a fundamental untruth which has long been discredited

Recent Examples on the Web

Cassidy warns against 'feeding into untruths' Cassidy later asked Saphier whether a parent should vaccinate their child with the MMR. — Sara Moniuszko, USA Today, 18 Sep. 2026

God is the infinite Mind that naturally causes each individual to know right from wrong, truth from untruth, and most importantly, reality from unreality. — Suzanne Riedel, Christian Science Monitor, 22 July 2026

And there are lies, so many untruths that one doesn’t know who to root for. — Oline H. Cogdill, Sun Sentinel, 20 July 2026

Skills such as digital literacy and being aware of AI’s biases and untruths are on one side of the coin. — Al Kingsley Mbe, Forbes.com, 10 July 2026

Word History

First Known Use

before the 12th century, in the meaning defined at sense 1

Rhymes for untruth

• bluetooth
• forsooth
• sawtooth
• tolbooth
• uncouth
• vermouth
• luth
• muth
• sleuth
• tooth
• youth

Kids Definition

untruth

noun

un·​truth ˌən-ˈtrüth 

ˈən-

1

: lack of truthfulness : falsity

2

: something that is untrue : falsehood, lie