obscurity

noun

the quality of being unclear or abstruse and hard to understand
不明瞭で、難解で、理解しにくい性質
the state of being indistinct or indefinite for lack of adequate illumination
十分な光がないため不明瞭ではっきりしない状態
an obscure and unimportant standing
不明瞭で重要でない状態

not well known
よく知られていない
- he worked in obscurity for many years
  彼は長年の間無名で働いた

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