Lewis Short
(adjective) : spīnōsus, a, um, spina
* Full of thorns or prickles, thorny, prickly.
* Lit.: caprae in spinosis locis pascuntur,Varr. R. R. 2, 3, 8: herbae,Ov. M. 2, 810: frutecta,Plin. 30, 11, 30, § 101: caulis,id. 19, 3, 17, § 47: folia,id. 20, 23, 99, § 262: cortex,id. 12, 15, 34, § 67: spinosior arbor,id. 24, 12, 67, § 109: fragmenta vertebrae,Cels. 8, 9 fin.
* Trop., thorny.
* Of style, harsh, crabbed, obscure, confused, perplexed: Stoicorum spinosum disserendi genus,Cic. Fin. 3, 1, 3: oratio,id. de Or. 1, 18, 83.—Comp.: haec enim spinosiora prius ut confitear me cogunt,Cic. Tusc. 1, 8, 16; id. Or. 32, 114; Varr. L. L. 8, § 51 Müll.—Sup.: praeceptorum nodosissimae et spinosissimae disciplinae,Aug. Doctr. Chr. 2, 37.
* Of cares, stinging, galling. irritating: curae,Cat. 64, 72; cf. spina, II.
Charlton T. Lewis, Charles Short, A Latin Dictionary