In which sentence if the word fanatic used correctly?

My uncle is so fanatic about the subject that there is no discussing it with him

The fanatic dictator did not allow himself to see the harm his policies created

It is not unusual to find people who are fanatic about cooking

As a fitness fanatic, she is committed to exercising several hours each day

1 answer

My uncle is so fanatic about the subject that there is no discussing it with him.