in ‧ vin ‧ ci ‧ ble /ɪnˈvɪnsəb ə l, ɪnˈvɪnsɪb ə l/ BrE AmE adjective
[ Date: 1400-1500 ; Language: French ; Origin: Late Latin invincibilis , from Latin vincere 'to defeat' ]
1 . too strong to be destroyed or defeated:
an invincible army
Young athletes think of themselves as invincible.
2 . an invincible belief, attitude etc is extremely strong and cannot be changed
—invincibility /ɪnˌvɪnsəˈbɪləti, ɪnˌvɪnsɪˈbɪləti/ noun [uncountable]