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Synonyms for Inadequate (same or very similar meaning)

WordNet sense 1 (not sufficient to meet a need):
poor, short

WordNet sense 2 (of a quantity not able to fulfill a need or requirement):
deficient, insufficient

WordNet sense 3 (not meeting requirements):
incapable, incompetent

WordNet sense 4 (inadequate in amount or degree):
lacking


From the ODE community, based on WordNetadd/edit