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mys·te·ri·ous

mysterious

 
 
pronunciation:
mih sti ri s
part of speech: adjective
definition 1: full of or relating to mystery.
"I have a secret," she said, in a mysterious whisper.
synonyms:
puzzling
antonyms:
open
similar words:
baffling, eerie
definition 2: not known and not able to be explained; puzzling.
Astronomers became interested in the mysterious flashes of light in the sky.
synonyms:
puzzling
similar words:
ambiguous, baffling, eerie, incomprehensible, obscure, unknown
derivations: mysteriously (adv.), mysteriousness (n.)