Something that is comprehensive includes everything that is needed. For example, a comprehensive study examines every detail of a subject; comprehensive plans consider every possibility.
1. …a comprehensive insurance policy.
2. Chapter 4 examines the last attempt to implement a comprehensive anti-poverty programme in Britain.
You do not use comprehensive to describe people who understand others and show them kindness and sympathy. You say that they are understanding.
3. Mrs Viccary turned out to be a delightful person, wise, tolerant and understanding.
4. I want so much to be as brave and as understanding as you are.
Instead of saying that something is comprehensive, you can say that it is done comprehensively.
5. We need designers able to deal with the design process comprehensively.