clandestine

adj. 秘密的，暗中从事的

cl, clack, clad, cladding, claim, claimant, clairvoyance, clairvoyant, clam, clambake, clamber, clammily, clamminess, clammy, clamor, clamorous, clamour (US clamor), clamp, clamp-down, clan, clang, clanger, clangorous, clangour (US clangor), clank, clanking, clannish, clannishly, clannishness, clansman, clap, clap eyes on, clapboard, clapper, clapper-board, claptrap, claret, clarification, clarify, clarinet,