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. 
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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.