inconsideracy
nounEtymology From inconsiderate + -cy.
1
Obsolete 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