hard-and-fast

American  

[hahrd-n-fast, -fahst] / ˈhɑrd nˈfæst, -ˈfɑst /

adjective

1. strongly binding; not to be set aside or violated.

   hard-and-fast rules.

   Synonyms:

   unambiguous, rigorous, inviolable, inflexible, precise, fixed

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hard and fast British  

adjective

1. (hard-and-fast when prenominal) (esp of rules) invariable or strict

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hard and fast Idioms  

1. Defined, fixed, invariable, as in We have hard and fast rules for this procedure. This term originally was applied to a vessel that has come out of water, either by running aground or being put in dry dock, and is therefore unable to move. By the mid-1800s it was being used figuratively.

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Other Word Forms

• hard-and-fastness noun

Etymology

Origin of hard-and-fast

First recorded in 1865–70

Example Sentences

It’s not a hard-and-fast rule because that would be wrong too.

From Los Angeles Times

Also, California has few hard-and-fast rules on residency.

From The Wall Street Journal

I’m not necessarily sold on hard-and-fast rules when it comes to age; it also depends on your risk tolerance, expected longevity and how long you intend to work.

From MarketWatch

Though it’s not a hard-and-fast rule, Los Angeles often likes to go its own way after the New York group announces its top film.

From Los Angeles Times

There’s no hard-and-fast rule about how long a jury must keep attempting to resolve differences before a mistrial can be declared.

From Seattle Times