Synonyms of hard and fast in English:

hard and fast


See definition of hard and fast

phrase

1‘there are no hard-and-fast rules about this’

SYNONYMS

definite, fixed, set, strict, rigid, binding, stringent, rigorous, clear-cut, cast-iron, established, inflexible, immutable, unalterable, invariable, unvarying, unchangeable, unchanging, incontestable, incontrovertible, uncompromising

ANTONYMS

flexible