| meaningless |
| modest(quiet, gentle, plain, aloof, reserved) |
| muffled(adjective, close, quiet, soft, low) |
| muted(adjective, close, quiet, soft, low) |
| mystic(clandestine, underground, undisclosed) |
| mystical(strange, unknown, clandestine, underground, curious) |
| mystifying |
| near |
| necromantic(strange, unknown, curious, concealed, inexplicable) |
| noiseless(adjective, close, quiet, soft, low) |
| noncommittal(adjective, quiet, gentle, aloof, peaceful) |
| nongregarious(adjective, cool, cold, sensitive, shy) |
| nonvocal(quiet, shy, silent, tight-lipped) |
| not forthcoming(expression, quiet, shy, silent, tight-lipped) |
| not giving away much |
| not saying boo(expression, adjective, idiom, close, quiet) |
| obscure(adjective, quiet, plain, strange, imperceptible) |
| occult(strange, clandestine, underground, undisclosed, inexplicable) |
| odd |
| offish(quiet, gentle, aloof, reserved, reticent) |