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Definitions

cardinal

[kahr-dn-l] / ˈkɑr dn l /
ADJECTIVE
important, key
Synonyms
STRONGEST
overriding
STRONG
basic central chief essential first fundamental leading main primary prime principal ruling
WEAK
basal bottom-line constitutive foremost greatest highest indispensable overruling paramount pivotal preeminent vital
Antonyms
STRONG
additional auxiliary extra inessential inferior last least minor nonessential outside peripheral secondary subordinate trivial unimportant unnecessary
WEAK
insignificant negligible

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

Kilmer reminds us of the internet’s cardinal rule: “If it sounds too good to be true, it likely is.”

From The Wall Street Journal • Apr. 3, 2026

Another trip in the works is to Spain, with potential events in Madrid, Barcelona and the Canary Islands, a Spanish cardinal said last month.

From Barron's • Feb. 10, 2026

It said the cardinal "distances himself from Monsignor Micheletti's statements and expresses his disappointment over what happened" and stated its "commitment to the protection of its artistic and spiritual heritage" against misuse or exploitation.

From BBC • Feb. 3, 2026

Perhaps the cardinal sin in Garten’s Thanksgiving guidebook is waiting until the very last minute to prepare and serve your Thanksgiving meal.

From Salon • Nov. 18, 2025

I think of the mud nest we made for the cardinal, all those years ago, and wonder if it’s still there.

From "All The Bright Places" by Jennifer Niven