clandestine
Cross references: 1. secret clan.des.tine \klan-'des-t*n\ aj [MF or L; MF clandestin, fr. L clandestinus, irreg. fr. clam]secretly; akin to L celare to hide - more at HELL : held in or conducted with secrecy : SURREPTITIOUS - clan.des.tine.ly av