Formal:
* The politician denounced the government's handling of the crisis.
* The human rights organization denounced the use of torture.
* The judge denounced the defendant's actions as "despicable."
Informal:
* I denounced my friend's terrible taste in music.
* The protesters denounced the company's environmental practices.
* The author denounced the movie adaptation of her book.
Figurative:
* The crumbling building seemed to denounce the neglect it had suffered.
* The silence in the room denounced the awkward tension.
Remember that "denounce" is a strong word that implies a public and formal condemnation. It's not usually used for casual disagreements or criticisms.