What is the single word to describe someone who doesn't appreciate what another person has done for them?
For example, let's say someone has sacrificed a lot of things and gone through a very hard life to make their spouse happy but the spouse leaves the person for very minor selfish reasons.
In other words, someone who is not appreciative of what the other person has done for them and never thinks twice to hurt the other person in exchange for the smallest benefit.
Best Answer
If it has to be a single word (I assume you mean a noun), then ingrate fits the bill. It's still in common speech, but only just. It has a slightly antique flavour.