unperceivedadj.

a1375 (c1350) William of Palerne (1867) l. 1676 Þat noþer clerk nor kniȝt..schal passe vnperceyued & pertiliche of-souȝt.

c1480 (a1400) St. Paul l. 280 in W. M. Metcalfe Legends Saints Sc. Dial. (1896) I. 37 He wet þe querch þat wes gud, and It, be grete merakill and mycht, wnpersawit of manis sicht, gaff it a-gane to p[l]ancilla.

c1500 Three Kings' Sons (1895) 84 Departid this yonge gentilman..so secretly that he was vnperceyued.

1533 T. More Apol. iii, in Wks. 848/1 They would..haue their false folies passe and repasse all vnperceiued.

1581 R. Mulcaster Positions xxxviii. 169 That cunning poet..saw in a goodly horse that was offered vnto Augustus Caesar an infirmitie vnperceaued by either looker on or any of his stable.

1594 W. Shakespeare Lucrece sig. H1 The Crow may..vnperceau'd flie with the filth away. View more context for this quotation

1665 R. Boyle Occas. Refl. iv. ix. sig. Dd6^v Moisture..convey'd but by little and little.., and by unperceived Passages, and yet..able to impart Fertility.

1667 J. Milton Paradise Lost xi. 224 Hee alone..took his way, Not unperceav'd of Adam. View more context for this quotation

1689 R. Baxter Treat. Knowl. & Love Compared i. iv. 33 The mind is afraid there may be some unperceived error.

1726 A. Pope tr. Homer Odyssey V. xxii. 194 Behind the felon unperceiv'd they past.

1768 J. Boswell Acct. Corsica p. xii Even the succession of Chiefs has been unperceived.

1769 H. Brooke Fool of Quality IV. xvii. 63 Unperceived of Harry, he displayed the bills to the company.

1834 Tait's Edinb. Mag. New Ser. 1 189/2 The intrenchment being cast up unperceived, in the middle of the night.

1842 I. Williams Baptistery I. i. 43 Time marks not Death with unperceived tread Steal on behind.

1889 ‘L. Carroll’ Sylvie & Bruno xviii. 260 I contrived, unperceived by her, to shake my head reprovingly at the pseudo-philosopher.

1904 N.Y. Evening Post 11 May 1 They are all nervous over the possibility that there may be a hitherto unperceived joker in the present bill.

1944 A. Thirkell Headmistress vi. 126 Lingering behind the others she slipped unperceived into the saloon and wandered round it.

1977 French Rev. 50 472 The presence of the additional participle..should not be confusing and indeed may pass unperceived by the student.

2013 Daily Post (Liverpool) (Nexis) 13 June 58 Broadcasters are facing previously unperceived global competition from illegal live streams of live football, now widely available online.