Unassailably

//ˌʌnəˈseɪləbli// adv

Definitions

Adverb
  1. 1
    In an unassailable manner.

    "Blank sightless eyes closed speechless mouth destined eternally to rigid frigidity (frigor mortis). Impenetrable, not an orifice in sight. Inviolably inviolate body unassailably confined within a wall of stone ("leda, lada, aflutter afraida, so does your girdle grow!")."

Adverb
  1. 1
    in an unalterable and unchangeable manner wordnet

Etymology

From unassailable + -ly.

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