Questions about example sentences with, and the definition and usage of "Avoidable"

A: "The horrible situation would have been avoidable had Alex not been so incompetent."
"The oil spill had been avoidable, so the companies had been charged with neglect."
"Was it avoidable?" "No, we didn't have a choice."
"My final paper for the class was unavoidable, yet I kept putting it off."

A: Evitable and avoidable are very similar. Both mean “able to be avoided”.

I just want to add that “Evitable” is a very rare word. It is part of the word “inevitable” (not evitable), which is much more frequently used.

Both “avoidable” and “unavoidable” are common.