mə̇ˈstirēəs, -tēr- adjective
Etymology: Middle French mysterieux, from mystere mystery (from Latin mysterium ) + -ieux -ious
1. : of or relating to mystery : containing, conveying, intimating, or implying a mystery : difficult or impossible to understand : obscure , enigmatical
a mysterious event
these mysterious changes
2.
a. : proper to or characteristic of a mystery or solemn rite
b. : stirred by or attracted to the inexplicable
• mys·te·ri·ous·ly adverb
• mys·te·ri·ous·ness noun -es