well-ˈreasoned,ppl.a. 1834J. S. Mill in Monthly Repos. VIII. 593 Lord Brougham..delivered a firm, steady, and well-reasoned opinion.1856Kane Arct. Expl. II. iii. 45 Whether from constitutional temperament, or well-reasoned argument, I find our state far from desperate.1871Earle Philol.Eng. Tongue ix. 457 A well-reasoned book.