| foxy(hidden, sly, fraudulent) |
| fraudulent(dishonest, cunning, deceitful, hidden, sly) |
| furtive(dishonest, cunning, deceitful, hidden, fraudulent) |
| furtively(clandestine, quietly, secretly, personally, privately) |
| guileful(dishonest, cunning, deceitful, sneaky, underhanded) |
| hush-hush(dishonest, cunning, clandestine, quietly, personally) |
| illegitimate(hidden, sly, fraudulent) |
| illicit(hidden, sly, fraudulent) |
| in camera(expression, clandestine, quietly, personally, privately) |
| in confidence(expression, quietly, secretly, personally, privately) |
| in holes and corners(expression, idiom, clandestine, quietly, personally) |
| in strict confidence(expression, idiom, quietly, secretly, personally) |
| indirect(dishonest, cunning, deceitful, crooked, sneaky) |
| insidiously(quietly, secretly, personally, privately, furtively) |
| intimately(quietly, secretly, personally, privately, furtively) |
| lubricious(adjective, dishonest, cunning, fickle, untrustworthy) |
| oblique(dishonest, cunning, deceitful, crooked, sneaky) |
| obscurely(quietly, secretly, personally, privately, furtively) |
| on the QT(expression, idiom, dishonest, deceitful, clandestine) |
| privately(clandestine, quietly, secretly, personally, slyly) |