undercover
WordReference English Thesaurus © 2025
Sense: Secret
Synonyms:
Sense: Secretly
Synonyms:
surreptitiously, stealthily, secretly
under cover
WordReference English Thesaurus © 2025
Synonyms:
in secrecy, clandestinely, hiding Collocations, concealed Collocations, hidden Collocations, secretive