INCONSIDERATION
inconsideration, inconsiderateness, thoughtlessness
(noun) the quality of failing to be considerate of others
Source: WordNet® 3.1
Etymology
Noun
inconsideration (countable and uncountable, plural inconsiderations)
Lack of due consideration; inattention to consequences, thoughtlessness.
new trained Souldiers, and such as are but novices in the trade, doe often headlong, and hand over head cast themselves into dangers, with more inconsideration, than afterward when they have seene and endured the first shocke, and are better trained in the schoole of perils.
Source: Wiktionary
In`con*sid`er*a"tion, n. Etym: [L. inconsideratio: cf. F.
inconsidération.]
Definition: Want of due consideration; inattention to consequences;
inconsiderateness.
Blindness of mind, inconsideration, precipitation. Jer. Taylor.
Not gross, willful, deliberate, crimes; but rather the effects of
inconsideration. Sharp.
Source: Webster’s Unabridged Dictionary 1913 Edition