VITIATE
invalidate, void, vitiate
(verb) take away the legal force of or render ineffective; “invalidate a contract”
mar, impair, spoil, deflower, vitiate
(verb) make imperfect; “nothing marred her beauty”
corrupt, pervert, subvert, demoralize, demoralise, debauch, debase, profane, vitiate, deprave, misdirect
(verb) corrupt morally or by intemperance or sensuality; “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® 3.1
Etymology
Verb
vitiate (third-person singular simple present vitiates, present participle vitiating, simple past and past participle vitiated)
(transitive) to spoil, make faulty; to reduce the value, quality, or effectiveness of something
(transitive) to debase or morally corrupt
(transitive, archaic) to violate, to rape
(transitive) to make something ineffective, to invalidate
Source: Wiktionary
Vi"ti*ate, v. t. [imp. & p. p. Vitiated; p. pr. & vb. n. Vitiating.]
Etym: [L. vitiatus, p. p. vitiare to vitiate, fr. vitium a fault,
vice. See Vice a fault.] [Written also viciate.]
1. 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.
A will vitiated and growth out of love with the truth disposes the
understanding to error and delusion. South.
Without care it may be used to vitiate our minds. Burke.
This undistinguishing complaisance will vitiate the taste of readers.
Garth.
2. To cause to fail of effect, either wholly or in part; to make
void; to destroy, as the validity or binding force of an instrument
or transaction; to annul; as, any undue influence exerted on a jury
vitiates their verdict; fraud vitiates a contract.
Source: Webster’s Unabridged Dictionary 1913 Edition