mysteriously

adverb
mys·​te·​ri·​ous·​ly | \ mi-ˈstir-ē-əs-lē How to pronounce mysteriously (audio) \

Definition of mysteriously

: 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

First Known Use of mysteriously

15th century, in the meaning defined above

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The first known use of mysteriously was in the 15th century

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