Synonyms for Speak loudly:

• v.

  •assert (verb)
  • speak up.
  •speak out/speak up (verb)
  • say loud and clear,
  • stand up for,
  • have one's say,
  • come out with,
  • make oneself heard,
  • make plain,
  • speak one's mind.
  •speak up (verb)
  • speak out.

• Other synonyms:

  •Other relevant words:
  • assert,
  • declare,
  • insist,
  • sound off,
  • let voice be heard.

Antonyms for Speak loudly:

• v.

  • speak out/speak up
    shut up, be quiet.