say it: in-AD-i-kwuh-see
inadequacy is a noun meaning "lack of an adequate quantity or number". It carries 3 recorded senses.
lack of an adequate quantity or number
“the inadequacy of unemployment benefits”
a lack of competence
“pointed out the insufficiencies in my report”
“juvenile offenses often reflect an inadequacy in the parents”
unsatisfactoriness by virtue of being inadequate
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for inadequacy come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.