requiring effort or concentration; complex and not easy to answer or solve; "raised serious objections to the proposal"; "the plan has a serious flaw"
of great consequence; "marriage is a serious matter"
concerned with work or important matters rather than play or trivialities; "a serious student of history"; "a serious attempt to learn to ski"; "gave me a serious look"; "a serious young man"; "are you serious or joking?"; "Don't be so serious!"
in a state of sexual virginity; "pure and vestal modesty"; "a spinster or virgin lady"; "men have decreed that their women must be pure and virginal"
concerned with theory and data rather than practice; opposed to applied; "pure science"
free from discordant qualities
(used of persons or behaviors) having no faults; sinless; "I felt pure and sweet as a new baby"- Sylvia Plath; "pure as the driven snow"
free of extraneous elements of any kind; "pure air and water"; "pure gold"; "pure primary colors"; "the violin's pure and lovely song"; "pure tones"; "pure oxygen"