adjective

mysterious

mysterious

He received a mysterious phone call.

He received a mysterious phone call.

Her motives remain mysterious.

Her motives remain mysterious.

a mysterious ((noun)) He received a mysterious phone call.

((to be)) mysterious Her motives remain mysterious.

Synonyms: enigmatic, puzzling, strange; Antonyms: clear, obvious, straightforward

From Latin 'mysterium' (secret rite). The suffix '-ous' means 'full of', so it means 'full of mystery'.

Think of a 'mystery' story. Something 'mysterious' is like a puzzle waiting to be solved.

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