Synonyms of serious in English:

serious


See definition of serious

adjective

1‘he had a serious expression on his face’

SYNONYMS

solemn, earnest, grave, sober, sombre, unsmiling, poker-faced, stern, grim, dour, humourless, stony-faced

thoughtful, preoccupied, deep in thought, pensive, meditative, ruminative, contemplative, introspective

staid, sedate, studious, bookish

ANTONYMS

light-hearted, cheerful, jovial

2‘we have some serious decisions to make’

SYNONYMS

important, significant, consequential, of consequence, momentous, of moment, key, grave, weighty, far-reaching, major

urgent, pressing, crucial, critical, vital, life-and-death, high-priority

no joke, no laughing matter

ANTONYMS

trivial, unimportant

3‘the president should give serious consideration to this advice’

SYNONYMS

careful, detailed, in-depth, deep, profound, meaningful

ANTONYMS

superficial

4‘a serious play about Art and Life’

SYNONYMS

intellectual, highbrow, heavyweight, deep, profound, literary, learned, scholarly, cultured

classical

informal heavy

ANTONYMS

light, lowbrow, populist

5‘four of the victims received serious injuries’

SYNONYMS

severe, grave, bad, critical, acute, alarming, worrying, grievous, dreadful, terrible, dire, extreme, dangerous, perilous, precarious

humorous, archaic parlous

ANTONYMS

minor, negligible

6‘is the government serious about developing decent employment opportunities for women?’

SYNONYMS

in earnest, earnest, sincere, wholehearted, genuine, meaning what one says

committed, firm, resolute, resolved, determined

ANTONYMS

uncommitted, half-hearted, flippant

7‘she spends serious sums of money’