| enigmatic(mysterious, private, reticent, taciturn, covert) |
| feline(mysterious, private, reticent, taciturn, covert) |
| furtive(mysterious, private, reticent, taciturn, covert) |
| hushed(mysterious, secret, private, reticent, taciturn) |
| in chambers(expression, mysterious, private, reticent, taciturn) |
| in privacy(expression, mysterious, private, reticent, taciturn) |
| in secret(expression, adverb, unknowing, hermetical, secretly) |
| in the background(expression, idiom, mysterious, reticent, taciturn) |
| in the dark(expression, idiom, mysterious, reticent, taciturn) |
| offstage |
| on the QT(expression, idiom, private, reticent, taciturn) |
| reserved(mysterious, private, reticent, taciturn, uncommunicative) |
| secretive(adjective, mysterious, private, reticent, unknowing) |
| silent(mysterious, private, reticent, taciturn, uncommunicative) |
| sub rosa(expression, adverb, secretly, confidentially) |
| tight-lipped(mysterious, private, reticent, taciturn, uncommunicative) |
| undercover(mysterious, private, reticent, taciturn, covert) |
| unforthcoming(mysterious, private, reticent, taciturn, covert) |
| withdrawn(mysterious, private, reticent, taciturn, covert) |
| zipped(mysterious, private, reticent, taciturn, covert) |