S: (v) weaken (lessen the strength of) "The fever weakened his body"
S: (v) change, alter, modify (cause to change; make different; cause a transformation) "The advent of the automobile may have altered the growth pattern of the city"; "The discussion has changed my thinking about the issue"
S: (v) load, adulterate, stretch, dilute, debase (corrupt, debase, or make impure by adding a foreign or inferior substance; often by replacing valuable ingredients with inferior ones) "adulterate liquor"
Adjective
S: (adj) diluted, dilute (reduced in strength or concentration or quality or purity) "diluted alcohol"; "a dilute solution"; "dilute acetic acid"