ABOMINATION
This word is used in the OT in reference to any iniquity as considered by God. It also designates what was not appropriate for the service of God, such as animals with defects presented as sacrifice.
It indicates the feeling of repulsion that any act against the established religious system caused. Of the latter we have an example in which for the Egyptians it was an abomination to eat with the Hebrews (Gen. 43:32).
The same religious service became an abomination to God by falling into mere external observance or by being associated with iniquity (Is. 1:13; Prov. 28:9). But it is specifically idolatry that is declared an abomination to Jehovah.
The idols themselves are so designated (2 Kings 23:13; Is. 44:19); in Ez. 8 we see the secret practice of idolatry, and the great abomination of introducing it into the very court of the house of the Lord. This word is used rarely in the NT, and is then applied to evil generally (e.g., Luke 16:15; Rev. 17:4).