The prefix used in a word to indicate opposite of, is ill. For example, illiterate
im sure positive it is correct
To denunciate is to accuse a group of people for doing something. A denunciation is an accusation.
Think about it, 16 years old? You become a adult when you turn 18. You would also have to be more responsible because 18 is the age you're actions have huge consequences. If you're 16 the worst that could happen is that you get grounded!