What is the meaning of Serius?

serious

grave, earnest, serious

comparative degree of sērō

rather late, later, too late

Serious:

1. Without humor or expression of happiness; grave in manner or disposition.

   Without humor or expression of happiness; grave in manner or disposition.

   Important; weighty; not insignificant.

   Really intending what is said (or planned, etc); in earnest; not jocular or deceiving.

   Used to express disbelief; seriously, for real.

   Source: wiktionary.org