gravely

adverb
1
in a very serious and important way; in a way that gives you a reason to feel worried
به طور جدی, بسیار جدی, به طور وخیم, وخامت‌آمیز
2
in a way that is serious in manner, as if something sad or important has just happened
به‌طور جدی, با حالت غم‌انگیز, به صورتی جدی
He nodded gravely as I poured out my troubles.