Debauch the young people with wine and women. Socrates was accused of corrupting young men. Do school counselors subvert young children?. Corrupt the morals.
source: WordNet 3.0
make imperfect
Nothing marred her beauty.
source: WordNet 3.0
take away the legal force of or render ineffective
Invalidate a contract.
source: WordNet 3.0
To make vicious, faulty, or imperfect; to render defective; to injure the substance or qualities of; to impair; to contaminate; to spoil; as, exaggeration vitiates a style of writing; sewer gas vitiates the air.