defile

/dɪˈfʌɪl/

verb

damage the purity or appearance of; mar or spoil.

'the land was defiled by a previous owner'

synonyms: spoil, sully, mar, impair, debase, degrade, pollute, poison, corrupt, taint, tarnish, infect, foul, befoul, dirty, soil, stain, destroy, ruin