unassailable, unshakable, watertight, bulletproof
(adjective) without flaws or loopholes; “an ironclad contract”; “a watertight alibi”; “a bulletproof argument”
unassailable, untouchable
(adjective) impossible to assail
impregnable, inviolable, secure, strong, unassailable, unattackable
(adjective) immune to attack; incapable of being tampered with; “an impregnable fortress”; “fortifications that made the frontier inviolable”; “a secure telephone connection”
Source: WordNet® 3.1
unassailable (comparative more unassailable, superlative most unassailable)
Secure against attack; impregnable.
(by extension) Undeniable, incontestable or incontrovertible.
Synonyms: incontestable, unopposable
unassailable (plural unassailables)
Something, such as a belief, that cannot be assailed.
Source: Wiktionary
8 June 2025
(noun) (law) the completion of a legal instrument (such as a contract or deed) by signing it (and perhaps sealing and delivering it) so that it becomes legally binding and enforceable
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