"Gradualism won't do. It's time for an abrupt change," said Vice Adm. Lee Gunn.

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But my heart, it won't obey,
It won't do, without you,
I doubt my heart, it won't obey,
It just won't do, without you

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Looking older? Well that won't do. Skincare products are helping men look young again.

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* (just) won't do

--じゃだめだ

（see also "You'll do" - The Beatles/"Hey Jude")