invincible
/ɪnˈvɪn.sə.bəl/ noun C2- Someone or something that cannot be defeated, destroyed, or killed.
Plural invincibles
From the library
Then an invincible and extreme terror seized upon him, and he dared not again press the hand that hung out of bed, he dared no longer to gaze on those fixed and vacant eyes, which he tried many times to close, but in vain—they opened again as soon as shut.
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