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mys·te·ri·ous

mysterious

 
 
pronunciation:
mih sti ri s
part of speech: adjective
definition: When something is mysterious, it is hard or impossible to explain or find out what it is.
A mysterious sound came from the attic, and we still don't know what it was.A mysterious light appeared in the sky, and some people thought it was from a space ship.
synonyms:
puzzling
similar words:
unknown
derivations: mysteriously (adv.), mysteriousness (n.)