Distill is a verb that refers to purifying or separating substances by boiling and then condensing the resulting vapor. Antonyms for this word include adulterate, defile, pollute, contaminate, dirty, corrupt, spoil, and taint. While distill typically implies the process of purifying or refining substances, these antonyms indicate the opposite; that is, they describe the process of making something impure or contaminated. In some cases, these antonyms may also refer to the process of weakening or degrading the quality of something. In conclusion, the antonyms for "dis-till" represent actions that have opposite meanings to purifying a substance.