adverb
in a secret manner
negotiated secretly with both sides
Synonyms: by stealth, clandestinely, covertly, furtively, hugger-mugger, in camera, privately, stealthily, sub rosa, surreptitiously
Related Word: confidentially; privatim, privily
Idioms: behind closed doors, on the qt, on the quiet, under the rose, under the table
Contrasted words: forthrightly, plainly, publicly; manifestly, overtly
Antonyms: openly