Adjective : UNASSAILABLE
Source: WordNet 3.1
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1. (
) immune to attack; incapable of being tampered with; "an impregnable fortress"; "fortifications that made the frontier inviolable"; "a secure telephone connection" ;
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2. (
) impossible to assail ;
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3. (
) without flaws or loopholes; "an ironclad contract"; "a watertight alibi"; "a bulletproof argument" ;
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