(idiom) utterly lacking in substance or meaning; describes speech or writing that is empty, shallow, and has no real content

to have no substance or actual content in one's speech or writing; empty talk

(idiom) the sky hangs low over the central and lower Yangtze, leaving an empty expanse as far as the eye can see

to look at something as if it were not there; to gaze vacuously; to treat someone or something with utter indifference or contempt