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mysterious (EN)
adjective

adjective “mysterious”

base form mysterious (more/most)
  1. strange; difficult to understand
    The old house was abandoned under mysterious circumstances.
  2. of unknown origin
    The villagers found a mysterious artifact while digging the new well.
  3. (of a person) deliberately not explaining something that others would like to know more about
    Despite our questions, Sarah remained mysterious about her weekend plans.