seriously

modif.

In a manner fraught with danger
dangerously, precariously, perilously, in a risky way, threateningly, menacingly, grievously, severely, harmfully, in a dangerous manner.
Antonyms safely*, harmlessly, in no danger.
In a manner that recognizes importance
gravely, soberly, solemnly, earnestly, solemnly, thoughtfully, sternly, sedately, with forethought, with sobriety, with great earnestness, all joking aside; see also sincerely.
Antonyms lightly*, thoughtlessly, airily.

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