\ ˈfȯl-tē How to pronounce faulty (audio) \
faultier; faultiest

Definition of faulty

: marked by fault or defect : imperfect

Keep scrolling for more

Other Words from faulty

faultily \ ˈfȯl-​tə-​lē How to pronounce faultily (audio) \ adverb
faultiness \ ˈfȯl-​tē-​nəs How to pronounce faultiness (audio) \ noun

Synonyms & Antonyms for faulty


amiss, bad, defective, flawed, imperfect


faultless, flawless, impeccable, perfect

Visit the Thesaurus for More 

Examples of faulty in a Sentence

the cause of the plane crash was traced to faulty wiring

Recent Examples on the Web

More evidence supporting the theory that faulty sensor data caused the crash of a Lion Air Boeing 737 MAX in October has emerged from the aircraft's flight data recorder. Sean Gallagher, Ars Technica, "Black box data shows pilots fought control system in Indonesia crash," 28 Nov. 2018 There is a kernel of truth to all of this: Human memory is notoriously faulty. Brian Resnick, Vox, "Donald Trump’s attack on Christine Blasey Ford’s memory is cruel — and wrong," 3 Oct. 2018 In 2014, Idaho officials incorrectly purged more than 750 voters from the electoral rolls based on faulty Crosscheck data. Marc Daalder, Detroit Free Press, "Michigan uses controversial voter registration check," 12 June 2018 House Republicans launched a multiyear investigation into the matter, arguing that the CFPB used faulty data to support the policy. Renae Merle, BostonGlobe.com, "Senate votes to kill a policy warning auto lenders about discrimination against minority borrowers," 19 Apr. 2018 House Republicans launched a multiyear investigation into the matter, arguing that the CFPB used faulty data to support the policy. Washington Post, latimes.com, "Senate poised to kill CFPB effort to prevent racial discrimination in auto loan market," 17 Apr. 2018 Photo: City Science/MIT Media Lab In December, a faulty battery caused an autonomous, cooler-size Kiwibot delivery robot to catch fire on the University of California, Berkeley campus, where the robots have been in testing for two years. Christopher Mims, WSJ, "Why Your Ice Cream Will Ride in a Self-Driving Car Before You Do," 5 Jan. 2019 Watch the video above to learn how Brandon Mayfield, an American lawyer, was accused of the 2004 Madrid train bombing based on faulty fingerprint analysis. Dean Peterson, Vox, "How reliable is fingerprint analysis?," 7 Aug. 2018 The cost of this flexibility, however, could be the formation of false or faulty memories: Silva’s mice became scared of a harmless cage because their memory of it was formed so close in time to a fearful memory of a different cage. Helen Shen, Scientific American, "Portrait of a Memory," 14 Mar. 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'faulty.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

See More

First Known Use of faulty

14th century, in the meaning defined above

Keep scrolling for more

Learn More about faulty

Dictionary Entries near faulty

fault trace

fault trough

fault vent


fault zone



Statistics for faulty

Last Updated

13 Apr 2019

Look-up Popularity

Time Traveler for faulty

The first known use of faulty was in the 14th century

See more words from the same century

Keep scrolling for more

More Definitions for faulty



English Language Learners Definition of faulty

: having a mistake, fault, or weakness


\ ˈfȯl-tē How to pronounce faulty (audio) \
faultier; faultiest

Kids Definition of faulty

: having a fault, flaw, or weakness : imperfect

Keep scrolling for more

More from Merriam-Webster on faulty

Rhyming Dictionary: Words that rhyme with faulty

Thesaurus: All synonyms and antonyms for faulty

Spanish Central: Translation of faulty

Nglish: Translation of faulty for Spanish Speakers

Britannica English: Translation of faulty for Arabic Speakers

Comments on faulty

What made you want to look up faulty? Please tell us where you read or heard it (including the quote, if possible).


likely to have or produce good results

Get Word of the Day daily email!

Test Your Vocabulary

Words from Greek and Latin Quiz

  • roman forum
  • Which of the following months comes from a Latin word for “ten”?
Name That Thing

Test your visual vocabulary with our 10-question challenge!

Dictionary Devil

Test Your Knowledge - and learn some interesting things along the way.

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!