Definition of subreptitious in US English:

subreptitious

adjective

  • 1Chiefly Ecclesiastical Law. Obtained by subreption; involving or characterized by the suppression of truth or the concealment of facts.

  • 2Secret; clandestine; = "surreptitious".

Origin

Mid 16th century; earliest use found in Glasse of Truthe. From classical Latin subreptīcius (also surreptīcius; in post-classical Latin also subreptitius, surreptitius) stolen, kidnapped, in post-classical Latin also false, deceitful, taking place by stealth + -ous.

Pronunciation

subreptitious

/ˌsʌbrɪpˈtɪʃəs/