1) Attaint 2) Defile 3) Dirty 4) Disgrace 5) Dishonor 6) Dishonour 7) Exclusively Anglo word 8) Exclusively Saxon word 9) Foul 10) Maculate 11) Make dirty 12) Muddy 13) Pollute 14) Shame 15) Soil 16) Spot, stain, or pollute 17) To contaminate, pollute 18) To make dirty or filthy 19) To make foul 20) To soil 1) Pollute 
• (a.) To make foul; to soil. • (a.) To entangle or run against so as to impede motion.
Be·foul' transitive verb [ imperfect & past participle Befouled ; present participle & verbal noun Befouling .] [ Confer Anglo-Saxon bef...lan ; prefix be- + f...lan to foul. See Foul , ...
defile verb spot, stain, or pollute; `The townspeople defiled the river by emptying raw sewage into it`
to make dirty or filthy; soil; defile; sully: a bird that befouls its own nest.