Antonyms of verb louden

2 senses of louden

Sense 1
louden -- (become louder; "The room loudened considerably")
       Antonym of quieten (Sense 1)
      => quieten, hush, quiet, quiesce, quiet down, pipe down -- (become quiet or quieter; "The audience fell silent when the speaker entered")

Sense 2
louden -- (cause to become loud)
       Antonym of quieten (Sense 3)
      => hush, quieten, silence, still, shut up, hush up -- (cause to be quiet or not talk; "Please silence the children in the church!")

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

2 senses of louden

Sense 1
louden -- (become louder; "The room loudened considerably")
       => change intensity -- (increase or decrease in intensity)

Sense 2
louden -- (cause to become loud)
       => 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")