adjective, faultier, faultiest.
having faults or defects; imperfect.

1300–50; Middle English fauty. See fault, -y1

faultily, adverb
faultiness, noun
nonfaulty, adjective
unfaulty, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
faulty (ˈfɔːltɪ)
adj , faultier, faultiest
1.  defective or imperfect
2.  archaic culpable

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

late 14c., from fault + -y (2).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Most condom failures result from incorrect use of the condom, not because the condom itself was faulty.
When such an outlet does not work because of a faulty switch, testing is
After all, users are on their own, with little in the way of legal redress for
  any damage caused by faulty software.
Today faulty human heart valves are routinely replaced with ones taken from
  cows and pigs.
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