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mysterious

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The definition of mysterious is something that is not understood or known.

(adjective)

An example of something mysterious is an old man who lives in a house and never comes outside.

See mysterious in Webster's New World College Dictionary

adjective

of, containing, implying, or characterized by mystery

Origin: < L mysterium (see mystery) + -ous

Related Forms:

mysteriously adverb
mysteriousness noun

See mysterious in American Heritage Dictionary 4

adjective

Of, relating to, or being a mystery: mysterious and infinite truths.
Simultaneously arousing wonder and inquisitiveness, and eluding explanation or comprehension: a mysterious visitor; mysterious conduct.

Origin:

Origin: French mystérieux

Origin: , from mystère, secret

Origin: , from Latin mystērium; see mystery¹

Related Forms:

mys·teˈri·ous·ly adverb

mys·teˈri·ous·ness noun

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