invulnerable - definition and synonyms

adjective 

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/ɪnˈvʌlnərəb(ə)l/
  1. impossible to defeat, harm, or damage
    invulnerable to:

    In the heart of the jungle, they felt invulnerable to an attack from the air.

derived word

invulnerability

 

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/ɪnˌvʌlnərəˈbɪləti/
noun [uncountable]