Serious
Important
Synonyms: Important, consequential, momentous, key, weighty, major, pressing, critical, life-and-death, no joke, careful, in-depth, profound, significant, of consequence, of moment, grave, far-reaching, urgent, crucial, vital, high-priority, no laughing matter, detailed, deep, and meaningful.
Solemn
Synonyms: Solemn, grave, sombre, poker-faced, grim, humourless, thoughtful, deep in thought, meditative, contemplative, staid, studious, earnest, sober, unsmiling, stern, dour, stony-faced, preoccupied, pensive, ruminative, introspective, sedate, and bookish.
Intellectual
Synonyms: Intellectual, heavyweight, profound, learned, cultured, heavy, highbrow, deep, literary, scholarly, and classical.
In earnest
Synonyms: In earnest, sincere, genuine, committed, resolute, determined, earnest, wholehearted, meaning what one says, firm, and resolved.
Severe
Synonyms: Severe, bad, acute, worrying, dreadful, dire, dangerous, precarious, grave, critical, alarming, grievous, terrible, extreme, perilous, and parlous.
Quality
Synonyms: Considerable, substantial, significant, tolerable, reasonable, hefty, comfortable, worthwhile, worth taking into account, plentiful, superabundant, large, profuse, marked, not to be sneezed at, plenteous, sizeable, appreciable, goodly, fair, tidy, handsome, decent, worth having, ample, abundant, great, lavish, generous, noticeable, and OK.
Example Sentences
This is a serious problem.
She has a serious injury.
He’s serious about his goals.
The situation requires serious attention.
That’s a serious commitment to make.