vitiated
Concise Oxford English Dictionary © 2008 Oxford University Press:
vitiate /ˈvɪʃɪeɪt/
▶verb formal spoil or impair the quality or efficiency of.
■ destroy or impair the legal validity of.
– derivatives
vitiation noun,
vitiator noun.
vitiation noun,
vitiator noun.
– origin C16: from L. vitiat-, vitiare ‘impair’.

