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adjective, fault·i·er, fault·i·est.
  1. having faults or defects; imperfect.
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Origin of faulty

First recorded in 1300–50, faulty is from the Middle English word fauty. See fault, -y1
Related formsfault·i·ly, adverbfault·i·ness, nounnon·fault·y, adjectiveun·fault·y, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for faulty


adjective faultier or faultiest
  1. defective or imperfect
  2. archaic culpable
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Derived Formsfaultily, adverbfaultiness, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for faulty


late 14c., from fault (n.) + -y (2). Related: Faultiness.

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Online Etymology Dictionary, © 2010 Douglas Harper