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Updated June 2026
Difficult or impossible to understand, explain, or identify. Full of or characterised by mystery; arousing curiosity or speculation because of being unknown or secretive.
“The mysterious disappearance of the ancient artefact has puzzled archaeologists for years.”
/mɪˈstiəriəs/
mys·te·ri·ous
10-letter adjective with -OUS ending; contains three S's and two Y's
Worth 15 points; the Y provides good scoring potential on premium squares
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