Definitions

defunct

[dih-fuhngkt] / dɪˈfʌŋkt /

ADJECTIVE

extinct, not functioning

Synonyms

STRONGEST

nonexistent obsolete vanished

WEAK

asleep bygone cold dead deceased departed done for down the drain exanimate expired gone had it inanimate inoperative invalid kaput late lifeless lost out of commission

Antonyms

WEAK

alive existent existing functioning live operating operative valid working

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

Now, customers of the defunct budget carrier are mourning the sub-$100 plane ticket that has virtually disappeared.

From MarketWatch • May 6, 2026

This month, it fined the auditor of defunct crypto exchange FTX.

From The Wall Street Journal • Apr. 20, 2026

Kinahan also had ties to the world of sport via his now defunct boxing management company MTK Global, which represented more than 100 boxers including Tyson Fury and Carl Frampton.

From BBC • Apr. 17, 2026

While it’s defunct now, CosMc’s helped McDonald’s gain insights into what resonates with customers and what doesn’t.

From Barron's • Apr. 13, 2026

With my cigar box of dollars and scrip left from my defunct newspaper delivery business, I went to Junior, the clerk at the drugstore counter, to find out.

From "October Sky" by Homer Hickam

Vocabulary lists containing defunct

300 Most Difficult "SAT" Words

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Grade 9, List 2

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The Lightning Thief

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