口くちほどにもない

expression, i-adjective

all bark and no bite; unable to live up to one's claims

Describes someone who talks big but cannot back it up with actions or ability. Often used critically.

• 彼かれは口くちほどにもない男おとこだ。

  He's all bark and no bite.

• あの政せい治じ家かの演えん説ぜつは立りっ派ぱだったが、結けっ局きょく口くちほどにもなかった。

  That politician's speech was impressive, but in the end he couldn't live up to his words.