implausible

adjective

im·​plau·​si·​ble (ˌ)im-ˈplȯ-zə-bəl 

: not plausible : provoking disbelief

an implausible excuse

implausibility

(ˌ)im-ˌplȯ-zə-ˈbi-lə-tē 

noun

implausibly

(ˌ)im-ˈplȯ-zə-blē 

adverb

Synonyms of implausible

• incredible
• incredulous
• unlikely
• impossible
• unconvincing
• inconceivable
• unbelievable
• absurd
• ridiculous
• doubtful
• unthinkable

Examples of implausible in a Sentence

She's been making implausible claims.

He gave an implausible excuse for showing up late for work.

The novel has an implausible ending.

Recent Examples on the Web

The Islamic Republic has always claimed that its domestic opponents were stooges of Israel and the United States, even when those charges were plainly implausible. —Laura Secor, The Atlantic, 16 June 2026

Suddenly the implausible prospect of qualifying for the World Cup was realistic. —Nick Miller, New York Times, 9 June 2026

Mekaneck is the Inspector Gadget of He-Man's gang, capable of periscoping his mechanical neck to implausible lengths and, er, not much else. —Richard Edwards, Space.com, 4 June 2026

Stop using implausible scenarios to scare young people and the gullible with claims about global catastrophe due to future global temperature increases. —Editorial, Boston Herald, 29 May 2026

Word History

First Known Use

circa 1677, in the meaning defined above

Rhymes for implausible

• plausible

Kids Definition

implausible

adjective

im·​plau·​si·​ble (ˈ)im-ˈplȯ-zə-bəl 

: causing disbelief : not plausible

implausibility

(ˌ)im-ˌplȯ-zə-ˈbil-ət-ē 

noun

implausibly

(ˈ)im-ˈplȯ-zə-blē 

adverb