Lewis Short
inconsīdĕrantĭa (noun F) : inconsiderans
* Want of reflection, inconsiderateness (= temeritas, incuria): alicujus inconsiderantiam sustinere (where some read considerantiam),Cic. Q. Fr. 3, 9, 2: mirari inconsiderantiam (al. inconsiderationem),Suet. Claud. 39; Salv. Gub. Dei, 1, 11.
Charlton T. Lewis, Charles Short, A Latin Dictionary