adjective

mysterious

mysterious, puzzling, secretive

She gave me a mysterious smile.

She gave me a mysterious smile.

A mysterious package arrived this morning.

A mysterious package arrived this morning.

mysterious ((noun)) He received a mysterious letter.

Synonyms: puzzling, enigmatic, inexplicable; Antonyms: clear, obvious

From 'mystery' plus the adjective-forming suffix '-ous'. 'Mystery' comes from Greek 'mysterion' (secret rite).

Think of a mystery novel – it's full of *mysterious* clues.

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