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IRONCLAD

Definition:

[adjective] inflexibly entrenched and unchangeable; "brassbound traditions"; "brassbound party loyalists"; "an ironclad rule"
Synonyms: brassbound
[adjective] without flaws or loopholes; "an ironclad contract"; "a watertight alibi"; "a bulletproof argument"
Synonyms: unassailable, unshakable, watertight, bulletproof