2 Answers

eth·i·cal [eth-i-kuhl] 
adjective
1.
pertaining to or dealing with morals or the principles of morality; pertaining to right and wrong in conduct.
2.
being in accordance with the rules or standards for right conduct or practice, especially the standards of a profession: It was not considered ethical for physicians to advertise.
3.
(of drugs) sold only upon medical prescription.

Ethical is doing what is the right thing to do.  
Is it ethical to blame someone else for a mistake YOU made?  No.  It is a lie.  A lie is NOT ethical.  
Is it ethical to change a price tag at the store when no one is watching?  Yes, it can be done. I did it back in 1976 on a baseball mitt (which I still have).  NO, that is stealing.  Stealing is NOT ethical.
Is it ethical to copy the answers from a classmate?  NO, that is cheating.  Cheating is NOT ethical.