Are there any words to describe people who talk but don't do practical things?

This kind of person is very annoying, so there are many words to describe this kind of person, such as:

A glimpse: the light on the water and the passing shadows will disappear in an instant. Metaphor observation is not meticulous, learning is not in-depth, and the impression is not deep.

Empty: empty, with no content. Many words and articles are extremely vague.

Talk big: it is unrealistic to describe things in a grandiose way.

Look on coldly: to look cold or indifferent. It means not to participate in this matter, to stand by and watch the development of things.

Scholar rebellion: intellectuals are dissatisfied with reality and struggle against it.

What to do: draw with your fingers and feet. Describing speaking with both hands and feet is also a metaphor for directing, pointing and criticizing.

On paper: on paper. Metaphor is empty talk, which can't solve practical problems. It is also a metaphor that empty talk cannot become a reality.

Pay lip service: it means that you have no practical skills, just talking.

Talk about Tao while sitting: talk about Tao while sitting. It refers to words, not actions.

Behind closed doors: behind closed doors. Metaphor is divorced from reality and only depends on subjective assumptions.