Read the dictionary definition of unassailable. All definitions for this word.
1. without flaws or loopholes
1. an ironclad contract
2. a watertight alibi
3. a bulletproof argument
2. impossible to assail
3. immune to attack; incapable of being tampered with
1. an impregnable fortress
2. fortifications that made the frontier inviolable
3. a secure telephone connection