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

But this time, the abundance of people in need of treatment is due to another ER in the neighborhood mysteriously shutting down. —Kimi Robinson, USA Today, 8 Jan. 2026

Margot Robbie’s alleged Letterboxd watches made the rounds before that account mysteriously disappeared. —Fran Hoepfner, Vulture, 8 Jan. 2026

More low-key than a sprawling celebration, more elegant (not to mention, mysteriously French) than a regular happy hour, the dînatoire may just be the perfect form of the holiday party. —Elly Leavitt, Vogue, 16 Dec. 2025

Jesse has disappeared mysteriously, and all the paranormal forces within the Oldest House are spilling out into the real world. —Nick Romano, Entertainment Weekly, 12 Dec. 2025

Word History

First Known Use

15th century, in the meaning defined above

Rhymes for mysteriously

• deliriously
• imperiously
• seriously