Antonyms of verb complain

1 of 2 senses of complain

Sense 1
complain, kick, plain, sound off, quetch, kvetch -- (express complaints, discontent, displeasure, or unhappiness; "My mother complains all day"; "She has a lot to kick about")
       Antonym of cheer (Sense 4)
      => cheer, cheer up, chirk up -- (become cheerful)

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

2 senses of complain

Sense 1
complain, kick, plain, sound off, quetch, kvetch -- (express complaints, discontent, displeasure, or unhappiness; "My mother complains all day"; "She has a lot to kick about")

Sense 2
complain -- (make a formal accusation; bring a formal charge; "The plaintiff's lawyer complained that he defendant had physically abused his client")
       => charge -- (make an accusatory claim; "The defense attorney charged that the jurors were biased")