seriously

adv

Definition: dangerously, critically
Antonyms: casually, minor, slightly, trivially

adv

Definition: not humorously
Antonyms: cheerfully, funnily, jovially, lightly

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IN BRIEF: adv. - To a severe degree; In a grave or solemn manner.

Have the courage to take your own thoughts seriously, for they will shape you. — Albert Einstein