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

The search for answers is underway after a Maryland man visiting Mexico for a destination wedding was mysteriously found dead at a popular resort in Cancun. —Janay Reece, CBS News, 23 Jan. 2026

In Weapons, from writer-director Zach Cregger, a small town is thrown into paranoia and terror when an entire classroom of children mysteriously disappears on the same night. —Matt Grobar, Deadline, 22 Jan. 2026

But when both of their husbands are mysteriously killed on duty, the women are whisked back stateside with no answers or closure. —Kelly Lawler, USA Today, 15 Jan. 2026

The next morning, Gerry (Corey Mylchreest) is found dead from a sleeping pill overdose, and one of the alarms has mysteriously disappeared. —Isadora Wandermurem, Time, 15 Jan. 2026

Word History

First Known Use

15th century, in the meaning defined above

Rhymes for mysteriously

• deliriously
• imperiously
• seriously