defective
adjectiveDefinition of defective
(Entry 1 of 2)
1a
: imperfect in form or function : faulty
replaced a defective light switch
b
: falling below the norm in structure or in mental or physical function
defective eyesight a defective gene
2
grammar
: lacking one or more of the usual forms of inflection (see inflection sense 3)
Must is a defective verb.
defective
nounDefinition of defective (Entry 2 of 2)
: a person who is subnormal physically or mentally
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