Definition of "temerarious"

[…] he furthwith by thinſtinct of yͤ ſpirite of god, in repꝛoche of all ſuch temerarious bold & blind iudgement, geuē vpon a mā whoſe inward mind and ſodain change they cannot ſee, ſhoꝛtly proued thē al deceiued, […]

1534 (date written; published 1553), Thomas More, “A Dyalogue of Comforte agaynste Tribulacyon, […]. Chapter XVII.”, in Wyllyam Rastell [i.e., William Rastell], editor, The Workes of Sir Thomas More Knyght, […], London: […] Iohn Cawod, Iohn Waly, and Richarde Tottell, published April 1557, book II, page 1206, column 2

To look back upon the past year, and see how little we have striven and to what small purpose; and how often we have been cowardly and hung back, or temerarious and rushed unwisely in; and how every day and all day long we have transgressed the law of kindness;—it may seem a paradox, but in the bitterness of these discoveries, a certain consolation resides.

1888, Robert Louis Stevenson, “A Christmas Sermon”, in Across the Plains: With Other Memories and Essays, London: Chatto & Windus, […], published 1892, part IV, pages 314–315

It was a very bright, hot winter's day, and try as I might, I could not bring myself to think of any danger. I believe that in this way most temerarious deeds are done; the doer has become insensible to danger, and his imagination is clouded with some engrossing purpose.

1910, John Buchan, “A Great Peril and A Great Salvation”, in Prester John, London, Edinburgh: Thomas Nelson and Sons, page 361

Primarily and supremely man is always the pioneer of life, adventuring onward into the unknown, alone with his own temerarious, dauntless soul.

1922, D[avid] H[erbert] Lawrence, “The Birth of Sex”, in Fantasia of the Unconscious, New York, N.Y.: Thomas Seltzer, page 152