on the quiet

covert fraudulent furtive hidden hush-hush illicit surreptitious underground

artful cloak-and-dagger closet concealed foxy illegitimate in holes and corners on the Q.T. private sneaky stealthy under wraps under-the-counter undercover underhand

aboveboard authorized honest known legal open public

forthright truthful

clandestine concealed crafty crooked cunning deceptive devious dirty-dealing dishonest dishonorable disingenuous double-crossing duplicitous fraudulent furtive guileful hush-hush indirect insidious oblique on the Q.T. secret secretive shady shifty slippery sly sneaking sneaky stealthy surreptitious treacherous tricky two-faced two-timing under wraps undercover underhanded unethical unfair unjust unscrupulous wily

underhanded

clandestine concealed crafty crooked cunning deceptive devious dirty-dealing dishonest dishonorable double-crossing duplicitous fraudulent furtive guileful hush-hush indirect insidious oblique on the Q.T. secret secretive shady shifty slippery sly sneaking sneaky stealthy sub-rosa surreptitious treacherous tricky two-faced two-timing under wraps undercover unethical unfair unjust unscrupulous wily

aboveboard forthright frank honest

clandestinely secretly surreptitiously

by stealth furtively hush-hush in camera in holes and corners on the Q.T. on the sly privately slyly stealthily sub-rosa under wraps undercover wildcat

candidly frankly honestly openly overtly publicly

clandestinely covertly furtively personally privately quietly stealthily surreptitiously

behind closed doors behind someone's back by stealth confidentially hush-hush in camera in confidence in holes and corners in secret in strict confidence insidiously intimately obscurely on the Q.T. on the sly privily slyly sub-rosa under the table underhandedly unobserved

publicly

openly