unconquerable

From un- +‎ conquerable.

• IPA^(key): /ʌnˈkɒŋkəɹəbəl/

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unconquerable (not comparable)

1. Not conquerable; indomitable.

   Synonym: inconquerable

   • 1886 October – 1887 January, H[enry] Rider Haggard, “The Spirit of Life”, in She: A History of Adventure, London: Longmans, Green, and Co., published 1887, →OCLC, pages 282–283:

     Be careful when power comes to thee also, lest thou too shouldst smite in thine anger or thy jealousy, for unconquerable strength is a sore weapon in the hands of erring man.

• unconquerability

unconquerable (plural unconquerables)

1. Someone or something that cannot be conquered.

• William Dwight Whitney, Benjamin E[li] Smith, editors (1911), “unconquerable”, in The Century Dictionary […], New York, N.Y.: The Century Co., →OCLC.
• “unconquerable”, in Webster’s Revised Unabridged Dictionary, Springfield, Mass.: G. & C. Merriam, 1913, →OCLC.