concernlessadj.
/kənˈsəːnləs/, U.S. /kənˈsərnləs/ Now rare.
Without concern; absolutely unconcerned. Also: characterized by a lack of concern.
ΘΚΠ
the mind > emotion > indifference > [adjective]
carelessOE
negligentc1390
recklessc1425
neutral1494
indifferent?1520
undifferentc1540
uncareful1560
unmindful1560
unaddicted1583
unmindful1585
perfunctory1602
disinteressed1603
come day, go day (God send Sunday)1616
disinteresteda1631
Laodicean1633
vacanta1639
unconcerned1645
easy1649
mawkish1679
indifferinga1694
concernless1706
unminding1714
nonchalanta1734
coolrife1768
uninterested1772
uncaring1786
tooth-picking1814
pococurante1815
pococurantish1821
insouciant1829
non-committal1829
don't-care1830
promiscuous1837
don't-carish1838
unpartial1840
noncurantist1882
noncuranta1913
casual1916
Gallionic1920
disengaged1958
1706 C. Cibber Perolla & Izadora v. i. 50 In every thing the Course of Nature still Keeps duly on, concernless in its Road.
1718 C. Cibber Non-juror iii. 44 Was it for him to see, as he believ'd, your Honour in so foul a danger, and stand concernless by?
1830 W. Johnstone tr. C. C. Sturm Morning Communings with God (ed. 3) I. 45 I will be as concernless as an infant in its parent's lap.
c1861 E. Dickinson Poems (1955) I. 206 While cool—concernless No—Nods from the Gilded pointers.
1918 Harper's Mag. June 82/1 Something had upset the torpid, concernless balance of his healthy, middle-aged mental ease.
This entry has been updated (OED Third Edition, September 2015; most recently modified version published online March 2022).
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adj.1706