This is the 880th most frequent Czech word.
vážně
"Vážně" means "seriously" in English.
In this sentence, 'vážně' is used as an adverb meaning 'seriously', describing the depth of thought.
Vážně jsem o tom přemýšlel.
I seriously thought about it.
Here, 'vážně' is used to inquire about the seriousness or sincerity of a statement or action.
Myslíš to vážně?
Do you mean it seriously?
In this usage, 'vážně' emphasizes the speaker's difficulty in understanding, conveying an intensified manner (akin to 'really').