The police are reluctant to pursue criminal charges in medical cases.

He has a passive character.

He is passive in everything.

His negative attitude rendered all my efforts useless.

They take this negative way of protesting against adult domination.

I don't like a negative sort of man.

The passive man seldom, if ever, expresses himself.

Observation is a passive science, experimentation an active science.

Why does Tom have such a negative attitude?

There are two contradicting emotions within the human heart. Needless to say, there isn't a person who doesn't feel empathy towards other's misfortunes. However, when you see a person finally able to overcome their misfortunes it is possible to feel a sense of dissatisfaction. To exaggerate a little, it leaves you with a sense that you want to see that person fall into the same misfortune again. Before you know it you unwillingly harbour a sense of hostility towards them.