surreptitious: [15] Latin surreptītius meant ‘taken away secretly’. It was formed from the past participle of surripere ‘take away secretly’, a compound verb formed from the prefix sub- ‘under’, hence ‘secretly’, and rapere ‘seize’ (source of English rape, rapture, etc). English acquired surreptitious direct from the Latin adjective. => rape, rapture, ravenous[surreptitious etymology, surreptitious origin, 英语词源]