to be all talk (and no action)
01
口だけで行動なし, 口先だけ
used to describe someone who continuously talks about what they are planning to do, but they never do or achieve much
非難的
慣用句
例
He's all talk and never delivers on his promises.
彼は口だけで、約束を果たさない。
口だけで行動なし, 口先だけ
彼は口だけで、約束を果たさない。