Synonyms for Keep quiet:

• n.

  •shut one's mouth (noun)
  • shut one's mouth.

• v.

  •secrete (verb)
  • conceal,
  • cover,
  • stonewall,
  • paper,
  • withhold,
  • disguise,
  • finesse,
  • cache,
  • secure,
  • shroud,
  • seclude,
  • whitewash,
  • ensconce,
  • deposit,
  • stash,
  • ditch,
  • screen,
  • plant,
  • squirrel,
  • harbor,
  • stow,
  • veil,
  • bury.

• Other synonyms:

  •
  • counsel.

Antonyms for Keep quiet:

• v.

  • secrete
    expose, disregard, ignore, let out, tell, take out, uncover, reveal, pour in, open, lay bare, let go, fill.
  • Other antonyms:
    babble out, let the cat out of the bag, sing, babble, blab out, spill the beans, tattle, blab, talk, peach.