Definition of insufficiently adverb from the Oxford Advanced Learner's Dictionary

  

insufficiently

 adverb
adverb
BrE BrE//ˌɪnsəˈfɪʃntli//
 
; NAmE NAmE//ˌɪnsəˈfɪʃntli//
 
(formal)
 
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to a degree that is not great enough for a particular purpose; not as much as is necessary The army was insufficiently strong to make further advances. opposite sufficiently