adj.
VERBS
▪ be , prove
▪
If the goods prove ~, the customer has the right to compensation.
ADVERB
▪ highly , seriously ( esp. BrE ), severely
▪
Her vision is severely ~.
▪ partially , slightly
▪ mentally
Defective is used with these nouns: ↑ brake , ↑ equipment , ↑ gene , ↑ goods , ↑ product , ↑ tyre , ↑ workmanship