The incident cemented their relations.

Solution (By Examveda Team)

Cemented : settle or establish firmly.
Destroyed : end the existence of (something) by damaging or attacking it.
Wasted : used or expended carelessly or to no purpose.
Corroded : destroy or damage (metal, stone, or other materials) slowly by chemical action.
Disintegrated : break up into small parts as the result of impact or decay.

Antonym of Cemented is Disintegrated