[f. as prec. + -NESS.] The quality of being thoughtless; want of thought or consideration; carelessness, inconsiderateness.
a. 1704. T. Brown, Praise Pov., Wks. 1730, I. 96. The remains of the night [they spend] in sleep, idleness, thoughtlessness [etc.].
1775. Adair, Amer. Ind., 420. Dry wood, with which they … provide themselves, but only from day to day, through their thoughtlessness of to-morrow.
a. 1862. Buckle, Misc. Wks. (1872), I. 27. Vice is often cunning and wary; but thoughtlessness is always profuse and reckless.
1884. Manch. Exam., 1 Oct., 3/1. The thoughtlessness of some of her actions is only equalled by their stupidity.
