Concerned with work or important matters rather than play or trivialities.
Of great consequence.
Causing fear or anxiety by threatening great harm:
— A serious wound.
— A serious turn of events.
Appealing to the mind:
— A serious book.
Completely lacking in playfulness.
Requiring effort or concentration; complex and not easy to answer or solve.
Moby thesaurus: abandoned, acute, afire, alarming, ardent, arduous, austere, awe-inspiring, bad, bound, bound and determined, burning, businesslike, cogitative, cognitive, committed, comprehensive, concentrating, concentrative, conceptive ... show more.
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