Excruciating
Part of speech: adjective
Definition: Causing great pain or anguish, agonizing Exceedingly intense; extreme
Example sentence: My life changed irrevocably four-and-a-half years ago when my spine failed and collapsed. I spent two years on the floor, in excruciating, debilitating and unrelenting pain. I can only describe the pain as being submerged into a vat of scalding acid that has an electric current running through it. And you can never get out, ever.
Painful
Part of speech: adjective
Definition: Full of pain; causing hurt, uneasiness or distress, either physical or mental; afflictive; disquieting; distressing.Requiring effort, labor or toil; difficult; executed with laborious effort; as a painful service; a painful march.Painstaking; careful; industrious
Example sentence: I learned a long time ago that some people would rather die than forgive. It's a strange truth, but forgiveness is a painful and difficult process. It's not something that happens overnight. It's an evolution of the heart.