Etymology
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inadequate (adj.)

"not equal to what is required, insufficient to effect the end desired," 1670s; see in- (1) "not, opposite of" + adequate. Related: Inadequately.

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Definitions of inadequate

inadequate (adj.)
lacking the requisite qualities or resources to meet a task;
the staff was inadequate
inadequate training
Synonyms: unequal
inadequate (adj.)
of insufficient quantity to meet a need;
an inadequate income
Synonyms: poor / short / jejune
From wordnet.princeton.edu