Synonyms of cardinal

cardinal

adjective

as in main

coming before all others in importance

the cardinal rule of medicine: do no harm

Synonyms & Similar Words

• main
• greatest
• highest
• primary
• predominant
• dominant
• foremost
• principal
• big
• first
• chief
• central
• key
• supreme
• leading
• sovereign
• paramount
• overriding
• primal
• premier
• master
• great
• prior
• capital
• grand
• major
• number one
• overbearing
• distinguished
• preeminent
• eminent
• top
• outstanding
• overmastering
• arch
• senior
• illustrious
• notable
• numero uno
• star
• noteworthy
• important
• signal
• stellar
• high-level
• superior
• prestigious
• noble
• influential
• momentous
• mighty
• famous
• incomparable
• significant
• celebrated
• renowned
• unequaled
• unparalleled
• famed
• matchless
• unsurpassed

Antonyms & Near Antonyms

• last
• least
• minor
• trivial
• unimportant
• insignificant
• secondary
• negligible
• slight
• subordinate
• collateral
• inferior
• inconsequential
• trifling
• inconsiderable
• subsidiary

Synonym Chooser

How is the word cardinal different from other adjectives like it?

Some common synonyms of cardinal are essential, fundamental, and vital. While all these words mean "so important as to be indispensable," cardinal suggests something on which an outcome turns or depends.

a cardinal rule in buying a home

Where would essential be a reasonable alternative to cardinal?

The meanings of essential and cardinal largely overlap; however, essential implies belonging to the very nature of a thing and therefore being incapable of removal without destroying the thing itself or its character.

conflict is essential in drama

When could fundamental be used to replace cardinal?

The words fundamental and cardinal are synonyms, but do differ in nuance. Specifically, fundamental applies to something that is a foundation without which an entire system or complex whole would collapse.

fundamental principles of algebra

When is vital a more appropriate choice than cardinal?

While in some cases nearly identical to cardinal, vital suggests something that is necessary to a thing's continued existence or operation.

cut off from vital supplies

Example Sentences

Recent Examples of cardinal

But panic-selling violates two or three cardinal rules of investing. —Daniel De Visé, USA Today, 10 Mar. 2026

The design once enjoyed by Javanese nobility references the sacred Javanese architectural vernacular style of saka guru, which represents the cardinal directions and has spiritual significance too. —Kathryn Romeyn, Architectural Digest, 9 Mar. 2026

Sort your laundry — but not by color The once cardinal rule of separating darks from whites before washing them has flown the coop. —The Washington Post, San Diego Union-Tribune, 28 Feb. 2026

To secure such an outcome means breaking his cardinal rule. —Dan Piepenbring, Harpers Magazine, 24 Feb. 2026

Phrases Containing cardinal

• cardinal virtue

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