sneakest (adjective) secret: underhand, clandestine
Sinonime: backdoor, backstairs, camouflaged,
classified,
close,
confidential,
covert,
cryptic,
discreet, disguised, dissembled, dissimulated,
furtive, hush-hush, in ambush,
incognito,
inside,
restricted,
secretive,
sly,
sneak,
sneaky,
stealthy, sub-rosa,
surreptitious, top secret, unacknowledged, under false pretense, under-the-table, underhanded
Antonime: aboveboard,
known,
legal,
legitimate,
public