'Invincibility' definitions:

Definition of 'invincibility'

From: WordNet
noun
The property being difficult or impossible to defeat [syn: indomitability, invincibility]

Definition of 'Invincibility'

From: GCIDE
  • Invincibility \In*vin`ci*bil"i*ty\, n. [Cf. F. invincibilit['e].] The quality or state of being invincible; invincibleness. [1913 Webster]

Synonyms of 'invincibility'

From: Moby Thesaurus