Ambition

Ambition (the bad kind) is when someone will do anything to get what they desire.

Adjective:ambitious

Banana: Did you see the news?
Potato: Yeah. Something about some rich dudes friend killing him because the friend thought the rich dude was too ambitious.
Banana: I personally think the friend was ambitious.
Potato: Sometimes ambition changes the way people think, and make them do things that they will regret later on.