full of hot air

Adjective

idiomatic

(idiomatic) Talking a lot, especially without saying anything of value or meaning.

Japanese Meaning

（中身がなく）おしゃべりをする、口先ばかりで実質のない話をする / 無駄話や意味のない話を延々とする

The candidate's promises sounded impressive, but everyone knew he was full of hot air.

その候補者の公約は聞こえは良かったが、誰もが彼は口先だけで中身がないと分かっていた。

Sense（1）

(idiomatic) Talking a lot, especially without saying anything of value or meaning.

Did the salesman tell you anything new, or was he just full of hot air?

more full of hot air

（ comparative ）

most full of hot air

（ superlative ）