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

 

inconsiderable

 adjective
adjective
BrE BrE//ˌɪnkənˈsɪdrəbl//
 
; NAmE NAmE//ˌɪnkənˈsɪdrəbl//
 
 
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Word Origin late 16th cent. (in the sense ‘impossible to imagine’): from French, or from late Latin inconsiderabilis, from in- ‘not’ + considerabilis ‘worthy of consideration’, from Latin considerare ‘examine’.Idioms
not inconsiderable
 
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(formal) large; large enough to be considered important We have spent a not inconsiderable amount of money on the project already.
See the Oxford Advanced American Dictionary entry: inconsiderable