mysteriously

adverb

mys·​te·​ri·​ous·​ly mi-ˈstir-ē-əs-lē 

: in a mysterious manner : in a way that is difficult to explain or comprehend

documents that have mysteriously disappeared

smiling mysteriously

"I've got the key to my castle in the air, but whether I can unlock the door remains to be seen," observed Jo mysteriously.

—Louisa May Alcott

Examples of mysteriously in a Sentence

Recent Examples on the Web

In 2014, the duo brought to the screen the epic story of Claire Randall, a British combat nurse who is mysteriously transported back to 1743 Scotland and marries Scottish warrior Jamie Fraser to survive. —Yvonne Villarreal, Los Angeles Times, 6 Mar. 2026

Also on the trail is a gangster named Clyde (John Magaro), who’s been sent to redo the job of rubbing out the mysteriously undead Ida. —Richard Brody, New Yorker, 4 Mar. 2026

But the suspect, who had been arrested 26 times, died mysteriously before police could question him. —Kori Rumore, Chicago Tribune, 28 Feb. 2026

An 8-year-old Navajo Nation girl who mysteriously died last month may have been struck and killed by a truck, the FBI said. —Emily Shapiro, ABC News, 26 Feb. 2026

Word History

First Known Use

15th century, in the meaning defined above

Rhymes for mysteriously

• deliriously
• imperiously
• seriously