| by stealth(expression, life, reply, unseen, doings) |
| on the sly(expression, idiom, life, reply, unseen) |
| secretly(clandestine, slyly, underhandedly, surreptitiously) |
| surreptitiously(clandestine, quietly, secretly, personally, privately) |
| artful(hidden, sly, fraudulent) |
| clandestine(adjective, dishonest, cunning, deceitful, secret) |
| clandestinely(clandestine, quietly, secretly, personally, privately) |
| cloak-and-dagger(hidden, sly, fraudulent) |
| closet(hidden, sly, fraudulent) |
| concealed(dishonest, cunning, deceitful, hidden, fraudulent) |
| covertly(quietly, secretly, personally, privately, furtively) |
| crafty(dishonest, cunning, deceitful, sneaky, underhanded) |
| crooked(dishonest, cunning, deceitful, sneaky, underhanded) |
| deceptive(dishonest, cunning, deceitful, crooked, sneaky) |
| devious(dishonest, cunning, deceitful, crooked, sneaky) |
| dirty-dealing(dishonest, cunning, deceitful, fickle, untrustworthy) |
| dishonest(cunning, deceitful, fickle, untrustworthy, crooked) |
| dishonorable(dishonest, cunning, deceitful, crooked, sneaky) |
| double-crossing(dishonest, cunning, deceitful, fickle, crooked) |
| duplicitous(dishonest, cunning, deceitful, fickle, untrustworthy) |