From Latin surrepticius (“stolen, furtive, clandestine”), from surreptus, past participle of surripere ("seize secretly, steal, pilfer"), from sub- ("under") + rapere ("to snatch").
surreptitious (comparative more surreptitious, superlative most surreptitious)
- Stealthy, furtive, well hidden, covert (especially movements).
1922, Ben Travers, chapter 1, in A Cuckoo in the Nest:
- He read the letter aloud. Sophia listened with the studied air of one for whom, even in these days, a title possessed some surreptitious allurement.