Définition : “Concerned with work or important matters rather than play or trivialities; "a _______ student of history"; "a _______ attempt to learn to ski"; "gave me a _______ look"; "a _______ young man"; "are you _______ or joking?"; "Don't be so _______!"”
Première lettre : S
Quel est le mot dont la définition vous est fournie ?
