: not to be modified or evaded : strict
a hard-and-fast rule

Examples of hard-and-fast in a Sentence

hard-and-fast rules that governed the corporate environment in those days included strictures regarding office dress that were rigidly enforced hard-and-fast beliefs that are the rock-solid foundation of their religion
Recent Examples on the Web Following the rhyme isn’t a hard-and-fast rule, but more of a starting point to fill out your board. Rachel Bernhard, Journal Sentinel, 26 Sep. 2024 Though there aren’t any hard-and-fast rules for planning a road trip — that’s the beauty of this type of travel — there are a few best practices to keep in mind when heading to the mountains of North Carolina. Lydia Mansel, Travel + Leisure, 24 Sep. 2024 Call it a supermoon a day or two before and after those phases, and that’s about right; Nolle’s supermoon is meant as a rough concept more than a hard-and-fast definition. Phil Plait, Scientific American, 13 Sep. 2024 In the absence of hard-and-fast rules from Congress, the U.S. has proven to be one of the most active enforcers of penalties and legal challenges against crypto companies. Mackenzie Sigalos, CNBC, 19 July 2024 See all Example Sentences for hard-and-fast 

These examples are programmatically compiled from various online sources to illustrate current usage of the word 'hard-and-fast.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.

Word History

First Known Use

1822, in the meaning defined above

Time Traveler
The first known use of hard-and-fast was in 1822

Dictionary Entries Near hard-and-fast

Cite this Entry

“Hard-and-fast.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/hard-and-fast. Accessed 1 Oct. 2024.

Kids Definition

hard-and-fast

adjective
ˌhärd-ᵊn-ˈfast
: not to be changed : fixed
a hard-and-fast rule
Last Updated: - Updated example sentences
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