adjective
Synonyms: secret 1, clandestine, covert, furtive, hole-and-corner, stealthy, sub-rosa, surreptitious, undercover, ||underneath
Antonyms: aboveboard
adjective
Synonyms: secret 1, clandestine, covert, furtive, hole-and-corner, stealthy, sub-rosa, surreptitious, undercover, ||underneath
Antonyms: aboveboard
Merriam Webster. Collegiate thesaurus English vocabulary. Английский энциклопедический словарь тезаурус. 2003