Merriam-Webster Logo
SINCE 1828
Menu
×

An Encyclopædia Britannica Company

hard–and–fast

play
adjective \ˌhärd-ən-ˈfast\

Definition of hard–and–fast

  1. :  not to be modified or evaded :  strict a hard–and–fast rule

See hard–and–fast defined for English-language learners

See hard–and–fast defined for kids

Explore Merriam-Webster

image386126722
Words That Come From the Dinner Table
alt-597233d35a146
Trending: 'Scaramouch,' Scaramucci Possibly to Fandango
alt-59721dd897313
The 'Best' Way to Sign Off On An E-mail
video-title-words-of-the-year-1066
Words of the Year: 1066

First Known Use of hard–and–fast

1822

hard–and–fast Synonyms

Synonyms
certain, determinate, final, firm, flat, frozen, hard, hard-and-fast, inexpugnable, set, settled, stable
Antonyms
alterable, changeable, elastic, flexible, mutable, variable
Related Words
nonadjustable, noncancelable, nonnegotiable, unchangeable; constant, steady, unchanging, uniform, unwavering; definite, exact, explicit, specific; given, stated, stipulated; dependable, good, reliable, responsible, safe, solid, sure, tried, tried-and-true, true, trustworthy, trusty
Near Antonyms
adjustable, changeable, negotiable; indefinite, open-ended, unspecified; capricious, changeful, flickery, fluctuating, fluid, inconstant, mercurial, mutable, temperamental, uncertain, unpredictable, unsettled, unstable, unsteady, variable, volatile

HARD–AND–FAST Defined for English Language Learners

hard-and-fast

play
adjective

Definition of hard–and–fast for English Language Learners

  • —used to say that something (such as a rule) cannot be changed

Learn More about hard–and–fast

  1. See words that rhyme with hard–and–fast

Seen and Heard

What made you want to look up hard–and–fast? Please tell us where you read or heard it (including the quote, if possible).

show hide

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!

WORD OF THE DAY

haphazard

play

marked by lack of plan or order

Get Word of the Day daily email!

TRENDING NOW

  1. scaramouch A new White House communications director

  2. non sequitur “It does not follow”

  3. admiral's mast A massive search ends with an 'admiral's mast'.

  4. calumny 'An untrue statement that is made to damage someone's reputation'

  5. kakistocracy Frustrated Twitter users have been searching for this word.

SEE ALL

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!

Words at Play

alt-59721dd897313
The 'Best' Way to Sign Off On An E-mail

Give them your best

image386126722
Words and Phrases That Come from the Dinner Table

Fill your plate with these surprising food words

ghost-being-disinvited-from-party
'Disinvite' or 'Uninvite'?

A disinvited guest is an uninvited problem

alt-596f730ceb5ae
Words We're Watching: 'Scoby'

Kombucha lovers unite.

Ask the Editors

video-title-words-of-the-year-1066
Words of the Year: 1066

Or, Why Pig Meat is Called 'Pork' and Cow Meat is Called 'Beef'

payday
How Often Is 'Biweekly'?

Don't get us started on 'bimonthly'

video-irregardless-grammar-peeve-blend-of-the-synonyms-irrespective-and-regardless
Irregardless

It is in fact a real word (but that doesn't mean you should use it).

video-moose-goose-weird-plurals
Weird Plurals

One goose, two geese. One moose, two... moose. What's up with that?

Word Games

emoji-the-quiz
The Emoji Quiz

Think you’re an emoji 👓 expert? Let’s see 🤔

Take the quiz
image941935269
A Game of Thrones Word Quiz

In the Game of Thrones quiz, you learn some new vocabulary. (It’s quite safe, really. You will not die.)

Take the quiz
Name That Thing
Name That Thing

Test your visual vocabulary with our 10-question challenge!

Take the quiz
Dictionary Devil
Dictionary Devil

The dictionary has been scrambled—can you put it back together?

Play the game