Synonyms of earnest in English:

earnest


See definition of earnest

adjective

1‘he had a reputation for being dreadfully earnest’

SYNONYMS
serious, serious-minded, solemn, grave, sober, humourless, staid, steady, intense
committed, dedicated, assiduous, keen, diligent, zealous, industrious, hard-working
studious, thoughtful, cerebral, deep, profound, bookish, donnish
ANTONYMS

frivolous, apathetic

2‘they were engaged in earnest prayer’

SYNONYMS
devout, heartfelt, wholehearted, sincere, impassioned, deeply felt, from the heart, full-hearted, fervent, fervid, ardent, passionate, intense, burning, urgent
literary passional, perfervid
ANTONYMS

half-hearted