unchallengeable

Adjective

unchallengeable (comparative more unchallengeable, superlative most unchallengeable)

1. Not open to challenge; indisputable
   • A century ago, a very distinguished Swiss military writer, who saw much service throughout the Napoleonic period, who studied minutely many of the principal campaigns, and who reflected profoundly upon international relations as affecting war, and as affected by it, stated as a fundamental...1821, The North American Review, O. Everett, page 645
   • With a solemn imprecation on the formality and absurdity of the writer, Lord Etherington let the letter of advice drop from his hand into the fire, and throwing himself into a chair, passed his hand across his eyes, as if their very power of sight bad been blighted by what he had read. His title...1824, Walter Scott, St. Ronan's Well, Archibald Constable and Company, Edinburgh, Hurst, Robinson, and Company, page 179

   Synonyms:

   inarguable, indisputable, unarguable