Definition of hard and fast in English:

hard and fast

phrase

  • (of a rule or a distinction made) fixed and definitive.

    ‘there are no hard and fast rules about that’
    • ‘Readers are apt to assume a hard and fast distinction between novel and romance.’
    • ‘Yet that rule isn't always as hard and fast as it would seem and sometimes actually demands to be broken.’
    • ‘The hours either side of dawn and dusk are generally the best, although this is not a hard and fast rule.’
    • ‘If a child is bright they will learn quicker than another child but there are no hard and fast rules.’
    • ‘I don't think there should be any hard and fast rules about this issue.’
    • ‘Like all rules governing taxation, the categories are never hard and fast.’
    • ‘One of the few hard and fast rules of comedy is that puppets are always funny.’
    • ‘In the few days he had been in the country, he had learned some very hard and fast rules.’
    • ‘The programme is mainly aimed at secondary school students, but there are no hard and fast rules and a number of primaries also take part.’
    • ‘As far as age limits are concerned, there are no hard and fast rules.’
    definite, fixed, set, strict, rigid, binding, stringent, rigorous, clear-cut, cast-iron, established, inflexible, immutable, unalterable, invariable, unvarying, unchangeable, unchanging, incontestable, incontrovertible, uncompromising
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Pronunciation

hard and fast

/ˌhɑːd ən ˈfɑːst/