adv. 25B6; adverb
they met secretly for a year : IN SECRET, in private, privately, behind closed doors, in camera, behind the scenes, under cover, under the counter, behind someone's back, furtively, stealthily, on the sly, on the quiet, conspiratorially, covertly, clandestinely, on the side; informal on the q.t.; formal sub rosa.
he was secretly jealous of Bartholomew : PRIVATELY, in one's heart (of hearts), deep down.