Synonyms of backstairs

1 Syllable
sly, sneak
2 Syllables
cryptic, stealthy, discreet, hush-hush, close, covert, sneaky, backdoor
3 Syllables
dissembled, sub-rosa, classified, disguised, inside, furtive, restricted
4 Syllables
camouflaged, secretive, underhanded, confidential, huggermugger, incognito, surreptitious
5 Syllables
under-the-table, dissimulated, unacknowledged