An adversary is someone opposed to you or in opposition to you. Therefore, adversary has a similar meaning to "enemy". Therefore, "adversary" is a synonym to the word "enemy", but is not an antonym for "enemy".
Antonyms for enemy would be:
Example sentence:
The United States and France were allies against their common enemy, the German troops, during World War II.
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Enemy , antagonist are several synonyms . Also; opponent, rival, competitor, foe, contestant
An antonym for alert would be notify or inform.
The antonym word for Ratlines would be Disratlines
A close antonym would be shrinkage.
The antonym (opposite) of opposite would be same, similar, or alike.