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say it: uhn-uh-SAY-luh-buhl
unassailable is an adjective meaning "immune to attack; incapable of being tampered with". It carries 3 recorded senses.
immune to attack; incapable of being tampered with
“an impregnable fortress”
“fortifications that made the frontier inviolable”
“a secure telephone connection”
impossible to assail
without flaws or loopholes
“an ironclad contract”
“a watertight alibi”
“a bulletproof argument”
Definitions, synonyms and semantic relations for unassailable come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.