noun
a lack of competence or ability; insufficiency
adjective
inadequate - not sufficient or suitable
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The inadequacy of the existing infrastructure was a major concern for the city planners.
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I can't believe the inadequacy of the wifi signal in this area.
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His excuses for being late were just a cover for his own inadequacy.
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The artist's use of negative space in the painting emphasized the feeling of inadequacy in the subject.