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History
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1) a person suffering from faulty vision caused by the lens of the eye having the wrong shape (astigmatic)

2) a state of nervous excitement; an interference in sound reproduced from a disc or tape, caused by faulty recording or reproduction (flutter)

Synonyms
UK
US
Meaning:
amiss

wrong(ly); out of order

wrong; defective

bad

not pleasant or enjoyable

poor quality

defective

imperfect

broken, not working

delinquent

(a person) doing wrong, behaving badly

irresponsible, defaulting

erroneous

(of an opinion etc) incorrect; mistaken

wrong, incorrect

fallible

(of a person) liable to make errors

able or prone to err

illogical

without, contrary to, logic

not making sense

imperfect

having faults; not complete

flawed

imprecise

not precise

erroneous

inaccurate

not accurate

erroneous

inadequate

not adequate; not enough; (of a person) not able, skilled or strong enough

defective, insufficient, incompetent

incorrect

not correct

wrong

indefensible

that cannot be defended, justified or excused

inexcusable

inefficient

(of a person) wasting time, energy etc in their work or duties

not working well; wasteful

inoperative

(of laws, rules etc) having no effect; useless

ineffectual

insufficient

not sufficient

not enough; lacking

lousy

filled with lice

very bad

subnormal

below normal (especially intelligence)

deficient, inadequate

unsound

not sound

not well; flimsy

vicious

given or done with evil or cruel intent

corrupt, wrong

wretched

very bad, sad etc; of poor quality

terrible, very bad

wrong

(of behaviour etc) morally bad, illegal, unjust; (of facts, reasons, time etc) not correct; untrue; not at all suitable

incorrect

FAULTY as in Wiktionary
FAULTY as in Wikipedia