| muffle(verb, calm, dull, quiet, suppress) |
| muzzle(verb, calm, dull, quiet, suppress) |
| mysterious(quiet, clandestine, underground, undisclosed, intriguing) |
| mystical(clandestine, underground, undisclosed) |
| not for publication(expression, adjective, idiom, secret, private) |
| occult(clandestine, underground, undisclosed) |
| on the QT(expression, idiom, dishonest, secret, private) |
| overawe(verb, calm, dull, quiet, suppress) |
| pipe down(verb, expression, calm, dull, quiet) |
| privileged |
| quash(verb, calm, dull, quiet, suppress) |
| quell(verb, calm, dull, quiet, suppress) |
| quiet down(verb, expression, calm, dull, quiet) |
| say nothing(verb, expression, calm, dull, quiet) |
| secrecy(calm, quiet, speech, silence, softness) |
| secretive(adjective, quiet, dishonest, cunning, deceitful) |
| sneak(clandestine, underground, undisclosed, skulking) |
| squelch(verb, calm, dull, quiet, suppress) |
| stifle(verb, calm, dull, quiet, suppress) |
| strike dumb(expression, calm, dull, quiet, suppress) |