网友对一个词的词性有疑问时，为什么不查词典呢？deep既可以是形容词，也可以是副词。例如《牛津》deep, adverb

(deeper, deepest) deep (below, into, under, etc.) a long way below the surface of something or a long way inside or into something

Dig deeper!

The miners were trapped deep underground.

whales that feed deep beneath the waves

He gazed deep into her eyes.

They sat and talked deep into the night (= until very late).deep in the forest

He stood with his hands deep in his pockets.

词典是最好的老师！