Synonym word of hard-and-fast:

absolute, binding, carved in stone, compulsory, conclusive, decisive, dictated, exacting, final, inflexible, irrevocable, mandatory, set, set in concrete, unalterable, unbending, written


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Synonyms:  A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z | Popular