In a defective manner; in a way that contains faults, flaws, or imperfections; imperfectly.
From 'defective' (Latin 'defectus' plus '-ive') plus English adverbial suffix '-ly.' The word modifies verbs or adjectives to describe defective action or quality.
This word captures an important reality in manufacturing and engineering—things don't have to be completely broken to be 'defectively made,' they just need to function poorly or below standard, which is why quality assurance teams use terms like this constantly.
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