Synonyms of secretly in English:

secretly


See definition of secretly

adverb

1‘the microphones had been used for secretly recording conversations’

SYNONYMS
covertly, without anyone knowing, in secret, in private, privately, in confidence, confidentially, behind closed doors, behind the scenes, behind someone's back, under cover, under the counter, discreetly, unobserved, quietly, furtively, stealthily, on the sly, on the quiet, privily, conspiratorially, clandestinely, on the side
sub rosa, in camera
informal on the q.t.
ANTONYMS

publicly

2‘I think he was secretly jealous of Bartholomew’

SYNONYMS
privately, in one's heart, in one's heart of hearts, in one's innermost thoughts
ANTONYMS

openly