Being deprived means lacking important things like food and water. For example, when warm clothing, housing, and nutrition are in short supply, the people are deprived of basics of life.
You can use the adjective deprived to describe conditions or people who don’t have what they need or don't have enough. Some uses of deprived are for small things, like when you're deprived of dessert because you didn’t eat your vegetables, but most of the time deprived describes a very serious lack of essential things or services.