1.
amateur, layperson
Someone who is not a professional or expert in a particular field; a nonprofessional.
Excuse my amateur thinking, but how about this method?
素人考え = amateur thinking/idea
Related Words
Antonym:
玄人 (professional, expert)
Antonym:
プロ (professional)
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専門家 (professional, expert)
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初心者 (beginner)
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アマチュア (amateur)
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入門者 (beginner)
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一般人 (ordinary person)
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門外 (outside the gate)
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専門外 (outside one's specialty)
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未経験者 (inexperienced person)