faulty

The definition of faulty is something unreliable or that doesn't work, or an incorrect thought pattern.

(adjective)

A toaster that doesn't toast bread is an example of a faulty toaster.
When you add 2+2 and get 5, this is an example of faulty reasoning.
When someone is a weak and not very nice person, this is an example of faulty character.

See faulty in Webster's New World College Dictionary

having a fault or faults; defective, blemished, imperfect, or erroneous

Origin: ME fauti

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See faulty in American Heritage Dictionary 4

adjective fault·i·er, fault·i·est

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