In a way that is strange, unclear, or difficult to understand; in a manner that suggests hidden or secret meaning.
From Latin 'mysterium' meaning 'secret rite' or 'mystery,' derived from 'mysteria' (sacred mysteries in religious ceremonies). The '-ly' suffix converts it to an adverb describing how something is done mysteriously.
The word 'mystery' comes from ancient religious secret ceremonies that only initiated members understood! The same root gives us 'mystic,' 'mystify,' and 'mystical'—all connected to hidden knowledge and spiritual secrets. Medieval people loved mystery!
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