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.

Whether the plumber directly caused the problem, failed to identify an underlying issue, or repaired one faulty component only for another to reveal itself, the result is the same: the cistern does not function properly.

From MarketWatch • Jun. 10, 2026

Project opponents also filed multiple lawsuits seeking to kill the project, alleging faulty environmental reviews and improper city approval.

From Los Angeles Times • Jun. 9, 2026

Nintendo promised in 2023 that it would repair or replace faulty controllers without cost, even if no longer covered by warranty.

From Barron's • Jun. 8, 2026

There’s a catch, says Schuna: The more active your hands are, the more faulty the sensor readings can be.

From The Wall Street Journal • Jun. 7, 2026

John Joly, also of Trinity, decided to give Edmond Halley’s ocean salts idea a whirl, but his method was based on so many faulty assumptions that he was hopelessly adrift.

From "A Short History of Nearly Everything" by Bill Bryson

Vocabulary lists containing faulty

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

Looking to grow your vocabulary? Check out this interactive, curated word list from our team of English language specialists at Vocabulary.com – one of over 17,000 lists we've built to help learners worldwide!

Drama

Interested in learning more words like this one? Our team at Vocabulary.com has got you covered! You can review flashcards, quiz yourself, practice spelling, and more – and it's all completely free to use!

Way Off: Synonyms for "Wrong"

Want to remember this word for good? Start your learning journey today with our library of interactive, themed word lists built by the experts at Vocabulary.com – we'll help you make the most of your study time!