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

 

invincible

 adjective
adjective
BrE BrE//ɪnˈvɪnsəbl//
 
; NAmE NAmE//ɪnˈvɪnsəbl//
 
 
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too strong to be defeated or changed synonym unconquerable The team seemed invincible. an invincible belief in his own ability Word Origin late Middle English (earlier than vincible): via Old French from Latin invincibilis, from in- ‘not’ + vincibilis (from vincere ‘to overcome’).
See the Oxford Advanced American Dictionary entry: invincible