faulty

[fawl-tee] / ˈfɔl ti /

ADJECTIVE

not working; incorrect

Synonyms

STRONGEST

broken cracked damaged defective deficient erroneous false flawed imprecise inaccurate inadequate incomplete insufficient invalid leaky malfunctioning unreliable

WEAK

adulterated amiss awry bad below par blamable blemished botched debased distorted fallacious fallible frail impaired imperfect inexact injured lame lemon maimed malformed marred out of order rank sick tainted unfit unretentive unsound warped weak wrong

Antonyms

STRONGEST

OK accurate adequate ample complete correct enough faultless fixed flawless honest perfect reliable right sufficient true unbroken valid working

WEAK

sound strong

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.

The Food and Drug Administration approved Regeneron Pharmaceuticals’ drug Otarmeni for children born with a faulty gene that plays a role in hearing.

From The Wall Street Journal • Apr. 23, 2026

One person died in an apartment fire ignited by a faulty e-bike battery in San José last week, authorities said.

From Los Angeles Times • Apr. 6, 2026

But they insisted that the platforms themselves negligently enabled this harm through faulty design of their services.

From Slate • Mar. 30, 2026

It again ties back to this faulty idea that there isn’t much return on investment for AI compute.

From Barron's • Mar. 27, 2026

Logic and Pseudoscience Since numbers and logic are inextricably intertwined both theoretically and in the popular mind, it’s perhaps not stretching matters too far to describe faulty logic as a kind of innumeracy.

From "Innumeracy: Mathematical Illiteracy and Its Consequences" by John Allen Paulos

Vocabulary lists containing faulty

Fake It 'Til You Make It: Synonyms for "False"

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Drama

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Way Off: Synonyms for "Wrong"

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