inconsideracy en · NOUN
Etymology
From inconsiderate + -cy.
Meanings
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(obsolete, uncountable) The quality of being inconsiderate; thoughtlessness.
This is the common effect of the inconsideracy of youth , against which I beg you will be most carefully upon your guard.
February 16 1748, Philip Stanhope, 4th Earl of Chesterfield, in Letters to His Son, published in 1774