- strongly binding; not to be set aside or violated: hard-and-fast rules.
Origin of hard-and-fast
First recorded in 1865–70
SynonymsSee more synonyms on Thesaurus.com
fixed, precise, inflexible, inviolable, rigorous, unambiguous.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for hard-and-fast
At the least, there must be hard-and-fast laws about insider trading, right?Are Ethics for Suckers?
April 11, 2011
They refuse to accept the hard-and-fast rules that are laid down for them.By the Christmas Fire
Samuel McChord Crothers
This is not a hard-and-fast rule, but one which usually it is safe to follow.The Pianolist
She taught me to dance against and around the hard-and-fast beat of the music.My Antonia
A matter with which, by hard-and-fast agreement, she has absolutely nothing to do!On the Stairs
Henry B. Fuller
So I bound myself by a hard-and-fast contract so that I could not escape.Mark Twain's Speeches
Mark Twain (Samuel Clemens)