Synonyms for Contaminating:

adj.

all (adjective)
corrupting, dirty.

n.

contaminating (noun)
dirty, infectious, corrupting.

v.

contaminating (verb)
corrupting, tampering with, debasing, adulterating, Doctoring.
dirtying (verb)
Defiling, Sullying, Smudging, Fouling, Smearing, Muddying, Befouling, Polluting, Tarnishing, Streaking, staining, Tainting, Putrefying, Besmirching, smirching, dirtying, soiling.
sickening (verb)
sickening, Infecting, poisoning.

Other synonyms:

Other relevant words:
dirty, infectious.