Definition of insufficient adjective from the Oxford Advanced American Dictionary

      

    insufficient

     adjective
    adjective
    NAmE//ˌɪnsəˈfɪʃnt//
     
    insufficient (to do something)insufficient (for something)
     
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  1. 1not large, strong, or important enough for a particular purpose synonym inadequate
  2. 2 insufficient time His salary is insufficient to meet his needs. opposite sufficient
  3. 3 The management paid insufficient attention to working conditions. There are fears that the existing flood barrier may prove insufficient.
 insufficiently
 
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adverb
insufficiency
 
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NAmE//ˌɪnsəˈfɪʃənsi//
 
noun [uncountable, singular] (technology) cardiac insufficiency
See the Oxford Advanced Learner's Dictionary entry: insufficient