1 grave or solemn: a quiet, serious boy; You're looking very serious.
az: ciddi
ru: серьёзный
2 (often with about) in earnest; sincere: Is he serious about wanting to be a doctor?
az: ciddi, səmimi
ru: серьёзный
3 intended to make people think: He reads very serious books.
az: ciddi
ru: серьёзный, глубокомысленный
4 causing worry; dangerous: a serious head injury; The situation is becoming serious.
az: ciddi, təhlükəli
ru: серьёзный; внушающий опасения