English

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

 

unassailable

 adjective
adjective
BrE BrE//ˌʌnəˈseɪləbl//
 
; NAmE NAmE//ˌʌnəˈseɪləbl//
 
(formal)
 
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that cannot be destroyed, defeated or questioned The party now has an unassailable lead. Their ten-point lead puts the team in an almost unassailable position. She replied with what she thought was unassailable logic…
See the Oxford Advanced American Dictionary entry: unassailable