seriös

Etymology
, from.

Adjective

 * 1) reputable, respectable, dignified; not shady or dubious; appearing civil, reliable, legitimate
 * 2)  giving such an impression, thus formal, elegant
 * 1)  giving such an impression, thus formal, elegant
 * 1)  giving such an impression, thus formal, elegant
 * 1)  giving such an impression, thus formal, elegant
 * 1)  giving such an impression, thus formal, elegant
 * 1)  giving such an impression, thus formal, elegant
 * 1)  giving such an impression, thus formal, elegant
 * 1)  giving such an impression, thus formal, elegant

Etymology
, from.

Adjective

 * 1) serious (meant or worthy of being taken seriously)
 * 2) reputable, trustworthy, legitimate, etc. (sometimes more idiomatic)
 * 1) reputable, trustworthy, legitimate, etc. (sometimes more idiomatic)
 * 1) reputable, trustworthy, legitimate, etc. (sometimes more idiomatic)
 * 1) reputable, trustworthy, legitimate, etc. (sometimes more idiomatic)
 * 1) reputable, trustworthy, legitimate, etc. (sometimes more idiomatic)

Usage notes
"Allvarlig" is more idiomatic for "serious" in the sense of "not joking" or "severe."