Antonyms of verb sour

1 of 2 senses of sour

Sense 2
sour, acidify, acidulate, acetify -- (make sour or more sour)
       Antonym of sweeten (Sense 1)
      => sweeten, dulcify, edulcorate, dulcorate -- (make sweeter in taste)

Synonyms/Hypernyms (Ordered by Estimated Frequency) of verb sour

2 senses of sour

Sense 1
sour, turn, ferment, work -- (go sour or spoil; "The milk has soured"; "The wine worked"; "The cream has turned--we have to throw it out")
       => change state, turn -- (undergo a transformation or a change of position or action; "We turned from Socialism to Capitalism"; "The people turned against the President when he stole the election")

Sense 2
sour, acidify, acidulate, acetify -- (make sour or more sour)
       => change taste -- (alter the flavor of)

Antonyms of adj soured

1 sense of soured

Sense 1
soured (vs. unsoured) -- (having turned bad)

unsoured (vs. soured) -- (not having turned bad)
        => fresh, sweet, unfermented -- (not soured or preserved; "sweet milk")

Similarity of adj soured

1 sense of soured

Sense 1
soured (vs. unsoured) -- (having turned bad)
       => off, sour, turned -- (in an unpalatable state; "sour milk")
          Also See-> sour#2