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口先

words, talk

k ɯ̟ t͡ɕ i s a̠ kʲ i
口 speech; words + 先 priority; being first
noun Rare #45,629
words, talk Often used critically for words not backed up by action.
JA: 口先だけでなく、行動で示してください。
EN: Please show it through your actions, not just your words.

口先ばかりだ

All talk and no action.

— アメリカン・ギャングスター (2007)

ただ口先ばかりでは何の役にも立たない。

Empty words alone are of no use.

口先だけでなくもっと実行が必要だ。

You need to do more than just talk; you need to take action.

口先よりも実践が大事なんだよ。

Actions speak louder than words.