insufficient
adjective OPAL W
  /ˌɪnsəˈfɪʃnt/
  /ˌɪnsəˈfɪʃnt/
(formal)- not large, strong or important enough for a particular purpose synonym inadequate
- insufficient time
 - 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.
 - insufficient to do something His salary is insufficient to meet his needs.
 - insufficient for something The plan was to refurbish the whole building but the funds raised were insufficient for the purpose.
 
Oxford Collocations Dictionaryverbs- be
 - prove
 
- quite
 - wholly
 - simply
 - …
 
- for
 
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’).