| elusive(sneaky, covert, secretive) |
| enigmatical(clandestine, underground, undisclosed) |
| equivocal(cover, obscure, dark, ulterior) |
| evasive(sneaky, covert, secretive) |
| feline(sneak, skulking) |
| for eyes only(expression, idiom, sensitive, sub-rosa) |
| hidden away(expression, sensitive, sub-rosa) |
| highly classified(expression, classified) |
| hole-and-corner(secret, private, hidden, spy, sneaky) |
| huggermugger(adjective, show) |
| illegitimate(hidden, fraudulent) |
| illicit(hidden, fraudulent) |
| implied(cover, obscure, dark, equivocal, ulterior) |
| in ambush(expression, sensitive, clandestine, underground, undisclosed) |
| in control of yourself(expression, idiom, calm, controlled, self-possessed) |
| indirect(dishonest, cunning, deceitful, sneaky, underhanded) |
| inside(clandestine, underground, undisclosed) |
| intelligence(secret, hidden, spy, covert) |
| kept concealed(expression, sensitive, sub-rosa) |
| laid back(expression, reasonable, tasteful, unobtrusive) |