IELTS Anvil

mystery

CEFR: B1

Something that remains unexplained, unknown, secret, or impossible to comprehend with existing empirical evidence.

Synonyms

enigma
conundrum
riddle

Common Collocations

unravel a mystery
shrouded in mystery
deep mystery

Example Sentence

The precise ceremonial purpose of Machu Picchu’s royal estate remained a historical mystery until twentieth-century excavations.

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