To save this word, you'll need to log in.
Definition of be mysterious
: to talk or behave in a way that makes other people feel that one must have a secret
What are you being so mysterious about?
Comments on be mysterious
What made you want to look up be mysterious? Please tell us where you read or heard it (including the quote, if possible).
Test Your Vocabulary
Obscure Shapes
- Something that is ooid is shaped like:
Can you spell these 10 commonly misspelled words?
TAKE THE QUIZ
Test Your Knowledge - and learn some interesting things along the way.
TAKE THE QUIZLove words? Need even more definitions?
Merriam-Webster unabridgedWords at Play
Ask the Editors
Share be mysterious