Hello Mandaly, I know that "thick" means "epe" or "pwès" in creole, but what are other words for "thick" in all contexts? Also, what are words for "to thicken" or "to become thick"?

You can also use 'founi' for thick when you are talking about hair, for example: Chive l founi. - Her hair is thick.
to become thick - kaye, vin pwès, kondanse

Haitian Creole ↔ English Reference, Look up Haitian Creole and English Words