Synonym: clandestine, cloak-and-dagger, furtive, hole-and-corner, hugger-mugger, hush-hush, secret, sneak, sneaky, stealthy, undercover, underground. Similar words: bumptious, ambitious, inception, perception, reception, exception, conception, apperception. Meaning: [‚sʌrep'tɪʃəs] 
adj. 1. marked by quiet and caution and secrecy; taking pains to avoid being observed 2. conducted with or marked by hidden aims or methods.
adj. 1. marked by quiet and caution and secrecy; taking pains to avoid being observed 2. conducted with or marked by hidden aims or methods. 31. In the absence of these causes, the differential diagnosis narrows to accidental, surreptitious, or even malicious hypoglycemia or endogenous hyperinsulinism.
32. BRIN : But some people do surreptitious things. They try to influence the system.
More similar words: bumptious, ambitious, inception, perception, reception, exception, conception, apperception, competition, practitioner, licentious, conscientious, current, currency, currently, surround, deceptive, antiseptic, surrounded, surrounding, envious, anxious, noxious, obvious, curious, various, dubious, constitutional convention, option, officious.