You searched for: “defective
defective (adjective), more defective, most defective
1. A reference to something that is faulty, broken, or imperfect: Grace said, “Please don’t use the coffee machine because it is defective!”

Jim's car had had defective brakes, so he had them replaced.

2. Pertaining to an incomplete, lacking, or inadequate condition: Somehow over the years the once good relationships between Caron's two sons turned out to be very defective because they had so many misunderstandings and arguments which they could not resolve.
Descriptive of something that is imperfect or faulty.
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defective, deficient
defective (di FEK tiv) (adjective)
Referring to something which is missing an element that is essential or critical for functioning properly: Bert had to return his vacuum cleaner to the store where he bought it because it was defective.
deficient (di FISH uhnt) (adjective)
Not up to typical expectations or standards; lacking in essential elements: The doctor stated that the tests indicated Chelsea was deficient in iron and needed to take a supplement.

Ethan noticed the defective valve in the engine. This is definitely deficient in terms of what he had expected from the manufacturer.

Units related to: “defective
(Greek: bad, harsh, wrong; ill; hard to do, difficult at; slow of; disordered; impaired, defective)
(Latin: bad, badly, harsh, wrong; ill; evil; abnormal, defective; used primarily as a prefix)