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hard-and-fast

[hahrd-n-fast, -fahst] /ˈhɑrd nˈfæst, -ˈfɑst/
adjective
1.
strongly binding; not to be set aside or violated:
hard-and-fast rules.
Origin
1865-1870
1865-70
Related forms
hard-and-fastness, noun
Synonyms
fixed, precise, inflexible, inviolable, rigorous, unambiguous.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for hard and fast

hard and fast

adjective
1.
(hard-and-fast when prenominal) (esp of rules) invariable or strict
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Idioms and Phrases with hard and fast

hard and fast

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.
The American Heritage® Idioms Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Difficulty index for hard-and-fast

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8
7
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