unobservern.
/(ˌ)ʌnəbˈzəːvə/, U.S. /ˌənəbˈzərvər/ Now rare.
A person who does not observe or is incapable of observing.
ΘΚΠ
the world > action or operation > manner of action > carelessness > [noun] > carelessness or heedlessness > one who
disregarder1661
inadvertist1679
unobserver1701
1701 D. Hamilton Inward Testimony Spirit Christ i. 116 The unobserver appears unsensible of his Folly.
1713 Guardian 20 May 1/1 How unheeded must the general Character of it be, when given by one of these Serene Unobservers.
1802 C. James New Mil. Dict. at Guard An intelligent officer upon an outpost..will materially strengthen his post, when the unobserver would remain inactive.
1888 Wade's Fibre & Fabric 8 Dec. 323/2 Now this may not seem bad to the unobserver, but nevertheless it is.
1900 H. D. Astley My Birds in Freedom & Captivity viii. 114 To lie still and simply watch, is a joy that the ordinary unobserver of birds doesn't know.
1931 Social Forces 9 335/1 Methods which arouse the vocal abilities of the participant unobserver readily sidetrack the patient observation of the plain facts of his social world.
This entry has been updated (OED Third Edition, December 2014; most recently modified version published online December 2021).
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n.1701