a. Also 6 brainsless. [f. BRAIN sb. + -LESS.]
1. Devoid of brain; that has had the brain removed, pithed.
c. 1440. Promp. Parv., 47. Braynles, incerebrosus.
1547. Life 70 Abps. Canterbury, To Rdr. A very charnell howse off brainslesse unlearned skulles.
1611. Speed, Hist. Gt. Brit., VII. xxxvi. (1632), 389. A brainlesse body.
1875. H. Wood, Therap. (1879), 196. The experiments on brainless frogs.
2. † a. Insane, mentally diseased, imbecile. Obs.
1496. Dives & Paup. (W. de W.), V. xxiv. 230. Yf the prynce be frentyke or braynles.
c. 1500. Blowbols Test., in Halliwell, Nugæ Poeticæ, 9. Braynles as a Marshe hare.
1625. trans. Gonsalvios Sp. Inquis., 164. Some caught vncurable diseases and paines in the head, and became almost brainlesse.
b. Foolish, irrational; wanting intelligence, thought or self-control.
c. 1470. Hors, Shepe, & G. (1822), 21. As souldyours that braynles be & wood.
1575. Churchyard, Chippes (1817), 127. George Carey, I haue receyved your braynlesse letter.
1797. Coleridge, Poems (1862), 36. The apostate by the brainless rout adored.
1863. Cornh. Mag., Feb. Life Man-of-War, 180. To what shifts a brainless man is put about.
Hence Brainlessly adv., Brainlessness.
1610. Healey, St. Aug. Citie of God, VI. vi. (1620), 232. I think no man so brainelessly sottish.
1884. T. A. Janvier, in Century Mag., Nov., 59/1. A good deal of hard swearing at his general brainlessness.