29 most important synonyms include Critical, Crucial, Essential, Vital, Key, Primary, Paramount, Principal, Central, and Significant. Most important is an adjective, and its antonyms are least significant and insignificant. Here are some additional synonyms for "most important" with example sentences.
29 other ways to say most important.
Education is the most important foundation.
Health is the most important factor.
The most important task is patience.