Synonyms for deficiency

Noun

1. lack, deficiency, want, need, demand

usage: the state of needing something that is absent or unavailable; "there is a serious lack of insight into the problem"; "water is the critical deficiency in desert regions"; "for want of a nail the shoe was lost"

2. insufficiency, inadequacy, deficiency, amount

usage: lack of an adequate quantity or number; "the inadequacy of unemployment benefits"