| ambiguous(obscure, unknown, clandestine, underground, undisclosed) |
| amoral(fickle, untrustworthy, unprincipled, dirty-dealing) |
| apprenticed(unknowing, hermetical, unbriefed) |
| avant garde(expression, secret, subversive) |
| back seat(expression, sub-rosa, groundward) |
| backstage(unknowing, hermetical, unbriefed) |
| behind the curtain(expression, idiom, unknowing, hermetical, unbriefed) |
| behind the scenes(expression, idiom, unknowing, hermetical, unbriefed) |
| below ground(expression, adjective, deep, hidden, underground) |
| between us(expression, adverb, sensitive, confidential, eyes-only) |
| bigamous(fickle, untrustworthy, unprincipled) |
| birdbrained(unknowing, hermetical, unbriefed) |
| blind to(expression, unknowing, hermetical, unbriefed) |
| bottom(sub-rosa, groundward) |
| bottom-rung(sub-rosa, groundward) |
| bottomward(sub-rosa, groundward) |
| buried(secret, hidden, underground, covert) |
| camouflaged(obscure, unknown, clandestine, underground, undisclosed) |
| caught napping(expression, unknowing, hermetical, unbriefed) |
| cautious(mysterious, private, reticent) |