Enmity suggests deep, often long-lasting feelings more intense than dislike. His enmity towards his rival could be felt in his every word.
Pro Tip 2/3
Strong Opposition
Use enmity to imply an active state of opposition, not passive dislike. The two politicians' enmity was evident during the heated debate.
Pro Tip 3/3
Personal or Abstract
Enmity can be directed towards people as well as ideas or entities. He harbored enmity not just toward his colleague, but also toward the company's policies.