Definition of interminable adjective from the Oxford Advanced American Dictionary

 

interminable

 adjective
adjective
NAmE//ɪnˈtərmənəbl//
 
 
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lasting a very long time and therefore boring or annoying synonym endless an interminable speech/wait/discussion The drive seemed interminable.
interminably
 
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NAmE//ɪnˈtərmənəbli//
 
adverb The meeting dragged on interminably.
See the Oxford Advanced Learner's Dictionary entry: interminable