Abomination (noun)

1. A thing that is detestable or disgustingly bad.
2. An action or practice that is greatly despised or abhorred.

Origin:

Middle english, from old french abomination, from latin abominatio, from abominari to deprecate, from ab- + ominari to predict (from omen).

Examples:

1. The dictator's regime was an abomination that caused immense suffering.
2. War is an abomination that should be avoided at all costs.
3. In the eyes of some religious groups, same-sex marriage is an abomination.
4. He considered dishonesty to be an abomination.
5. Many people consider the use of chemical weapons to be an abomination and a war crime.