violate has 17 distinct synonyms spread across 5 of its 6 senses. Each sense below keeps its own list, because a synonym belongs to a meaning and not to a word: swapping one sense's substitute into another sense's sentence is how a thesaurus makes writing worse. Its one recorded opposite is conform to.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
fail to agree with; be in violation of; as of rules or patterns
“This sentence violates the rules of syntax”
act in disregard of laws, rules, contracts, or promises
“offend all laws of humanity”
Synonyms, antonyms and the broader and narrower relations for violate come from Princeton University’s WordNet. Full sources and licences.