misterioso
adverb (or adjective)
mi·ste·ri·o·so
məˌstirēˈō(ˌ)sō,
(ˌ)miˌs-,
-)zō
: in a mysterious manner —used as a direction in music
Word History
Etymology
Italian, mysterious, from mistèrio, mistèro mystery (from Latin mysterium) + -oso -ose (from Latin -osus)