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もっともだ

reasonable

→ 尤もだ
phrase Uncommon #8,737
reasonable Used to say that someone's action, opinion, or reaction is understandable or justified. Often translated as “it's only natural” or “that's understandable.”
JA: 彼女が怒るのももっともだ。
EN: It's understandable that she is angry.

彼がその画家を尊敬するのはもっともだ。

It's only natural that he respects that painter.

彼が家の自慢をするのはもっともだ。

He has every right to be proud of his house.

中佐君の要望はもっともだと思う

I think Lieutenant Colonel Nakasa’s request is perfectly reasonable.

— エリート・スクワッド ブラジル特殊部隊BOPE (2010)

彼女がその成功を喜ぶものももっともだ。

It's only natural that she would be pleased with that success.

貴方の指摘は至極もっともだ

Your point is perfectly valid.

— レッドクリフ Part I (2008)

彼がひどく怒るのはもっともだ。

It’s only natural that he’s extremely angry.