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!"
something of value given by one person to another to bind a contract
characterized by a firm and humorless belief in the validity of your opinions; "both sides were deeply in earnest, even passionate"; "an entirely sincere and cruel tyrant"; "a film with a solemn social message"
experiencing intense pain especially mental pain; "an anguished conscience"; "a small tormented schoolboy"; "a tortured witness to another's humiliation"
having a strong distaste from surfeit; "grew more and more disgusted"; "fed up with their complaints"; "sick of it all"; "sick to death of flattery"; "gossip that makes one sick"; "tired of the noise and smoke"