Reverse Dictionary: CONFIDENTIAL

ADJECTIVES
17C.. ► CABINET confidential, secret, private 
1884 ► PARTICULAR confidential, private → Sc.
1950 ► COPA confidential, secret → sl.
1950 ► COPACETIC → COPASETIC → KOPASETIC confidential, secret → sl.
1950 ► COPASETTY  confidential, secret  → sl.
1950 ► COPESETTE →  KOPASETTE  confidential, secret  → sl.
1950 ► COPUS confidential, secret → sl.

ADVERBS
1884 ► ON THE QT confidentially, quietly → UK sl.
1904 ► SUB ROSA confidentially, secretly → colloq. (Bk.).
1930 ► UNDER THE LAP confidentially → Aust. sl.

VERBS
19C.. ► HOB-NOBBLE to talk confidentially and intimately together → Eng. dial.