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Webster 1913 Edition

Adj.

[L.

obreptitus

. See

Done or obtained by surprise; with secrecy, or by concealment of the truth.

[R.]

Cotgrave.

Adj.

[supra.] Done or obtained by surprise; with secrecy or by concealment of the truth.

obreptitious ‎(comparative more obreptitious, superlative most obreptitious)

Done or obtained by surprise, with secrecy, or by concealment of the truth.
(Can we find and add a quotation of Cotgrave to this entry?)