adulterating

Verb

• corrupt, debase, or make impure by adding a foreign or inferior substance; often by replacing valuable ingredients with inferior ones
• present participle and gerund of adulterate

Adjective

• making impure or corrupt by adding extraneous materials
  • "the adulterating effect of extraneous materials"

Synonyms

adulterant, adulterate, debase, dilute, load, stretch

Antonyms

purifying