dilute

(verb) lessen the strength or flavor of a solution or mixture. Synonyms: thin, thin out, reduce, cut. Example: "Cut bourbon."

(verb) corrupt, debase, or make impure by adding a foreign or inferior substance; often by replacing valuable ingredients with inferior ones. Synonyms: load, adulterate, stretch, debase. Example: "Adulterate liquor."

(adj) reduced in strength or concentration or quality or purity. Synonyms: diluted (vs. undiluted). Examples: "Diluted alcohol." "A dilute solution." "Dilute acetic acid."