restraint
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どうぞ遠慮なく意見を言ってください。
Please do not hesitate to share your opinion.
彼は遠慮がちで、自分から話しかけない。
He is rather reserved and does not speak up first.
遠慮も時には必要だが、言うべき時は言うべきだ。
Restraint is sometimes necessary, but you should speak when you need to.