Adulterating

v. corrupt, make inferior; water down milk or other liquids

Adjective
1. making impure or corrupt by adding extraneous materials; "the adulterating effect of extraneous materials"
(synonym) adulterant
(antonym) purifying
(similar) extraneous, foreign

Verb
1. corrupt, debase, or make impure by adding a foreign or inferior substance; often by replacing valuable ingredients with inferior ones; "adulterate liquor"
(synonym) stretch, dilute, debase
(hypernym) corrupt, spoil
(hyponym) water down
(verb-group) extend, stretch
(derivation) adulterant, adulterator
Adjective
1. mixed with impurities
(synonym) adulterated, debased
(similar) impure

(p. pr. & vb. n.)
of Adulterate
  

ADULTERANDO. CONTRAFFANDO. FALSIFICANDO. CORROMPENDO