Definition of indefinable adjective from the Oxford Advanced American Dictionary

 

indefinable

 adjective
adjective
NAmE//ˌɪndɪˈfaɪnəbl//
 
 
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difficult or impossible to define or explain She has that indefinable something that makes an actress a star. He felt, in some indefinable way, that he had come home.
indefinably
 
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NAmE//ˌɪndɪˈfaɪnəbli//
 
adverb
See the Oxford Advanced Learner's Dictionary entry: indefinable