nightlessadj.
/ˈnʌɪtlᵻs/, U.S. /ˈnaɪtlᵻs/ Lacking any period of night or darkness; having no night.
ΘΚΠ
the world > matter > light > naturally occurring light > [adjective] > without darkness
unobscured1598
nightless1613
unbenighted1667
1613 S. Purchas Pilgrimage 434 The Sun (whose presence they are long deprived of in the winter, which is recompensed in their night-lesse Summer).
1650 J. Trapp Clavis to Bible (Gen. xlvi. 29) 355 Think of that glorious night-less day.
1825 W. Hone Every-day Bk. (1826) I. 772 Midsummer, or nightless days, now begin.
1853 W. M. Thomas in Househ. Words 30 July 505/1 The nightless days of summer solstice.
a1866 J. C. Prince Sick Man's Fancies in Poet. Wks. (1880) 123 I lay many nightless days, While the terrible sun's unconquered blaze Blistered and scorched my shrivelled skin.
1934 W. Moffatt (title) Shetland: the isles of nightless summer.
1986 Daily Tel. 12 July 8/6 In the nightless months everyone has phenomenal energy.
Derivatives
ˈnightlessness n. rare
ΘΚΠ
the world > matter > light > [noun] > state of being light
lightnessOE
shadowlessness1881
shadelessness1894
nightlessness1897
1897 Expositor Sept. 208 All liberty is the result of nightlessness.
1897 Expositor (London) 6 162 The main feature of the city is the nightlessness.
This entry has been updated (OED Third Edition, September 2003; most recently modified version published online March 2022).
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adj.1613