English

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

 

ineffable

 adjective
adjective
BrE BrE//ɪnˈefəbl//
 
; NAmE NAmE//ɪnˈefəbl//
 
(formal)
 
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too great or beautiful to describe in words ineffable joy Word Origin late Middle English: from Old French, or from Latin ineffabilis, from in- ‘not’ + effabilis (from effari ‘utter’).
See the Oxford Advanced American Dictionary entry: ineffable