seriously
UK: ˈsɪə.ri.əs.li | US: ˈsɪr.i.əs.li
adv. in a sincere or earnest manner
adv. to a severe or significant degree
adv. used to emphasize a statement or opinion
The word "seriously" derives from the adjective "serious," which entered English in the early 15th century from Old French serieux (grave, earnest), itself from Latin serius (weighty, important). The suffix -ly, of Old English origin, is a common adverbial marker indicating manner or degree. Combined, "seriously" literally means "in a grave/earnest manner," later extending to emphasize intensity or sincerity.
She spoke seriously about the need for climate action.
He was seriously injured in the accident.
Are you seriously considering that job offer?
The situation is seriously concerning.
"Seriously, you need to stop procrastinating," she said.