Definition of insufficient adjective from the Oxford Advanced Learner's Dictionary



BrE BrE//ˌɪnsəˈfɪʃnt//
; NAmE NAmE//ˌɪnsəˈfɪʃnt//
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insufficient (to do something) | insufficient (for something) (formal) not large, strong or important enough for a particular purpose synonym inadequate insufficient time His salary is insufficient to meet his needs. opposite sufficient The management paid insufficient attention to working conditions. There are fears that the existing flood barrier may prove insufficient. I’m afraid we have insufficient evidence. Word Originlate Middle English (in the sense ‘incapable, incompetent’): via Old French from late Latin insufficient- ‘not sufficing’, from in- ‘not’ + Latin sufficere ‘put under, meet the need of’ (from sub- ‘under’ + facere ‘make’).
See the Oxford Advanced American Dictionary entry: insufficient