1603, John Florio, translating Michel de Montaigne, Essays, II.8:I ... take care for the general, to have a regardfull respect of that which you leave behind you.
1596, Edmund Spenser, The Faerie Queene, IV.7:And evermore, when with regardfull sight She looking backe espies that griesly wight Approching nigh, she gins to mend her pace ….