lassus, a, um, adj. etym. dub.; acc. to Bopp, Gloss. 112, 6, for glassus from glasnus; kindred to Sanscr. glasnu, fessus, defessus, lassus; but more prob. collat. form of laxus; cf. langueo, faint, languid, weary, tired, exhausted (syn.: fessus, fatigatus, defatigatus; mostly poet. and in post-Aug. prose; not in Cic. or Cæs.). Lit.: lassus de via, Plaut. Ps. 2, 2, 66: opere faciundo, id. As. 5, 2, 23: lassus jam sum durando miser, id. Truc. 2, 3, 6; cf.: Romani itinere atque opere castrorum et proelio fessi lassique erant, Sall. J. 53: recto itinere lassi, Quint. 2, 3, 9: assiduo gaudio, Plin. 37, 1, 1, § 3: ab equo indomito, Hor. S. 2, 2, 10: lasso mihi subvenire, Plin. Ep. 9, 36, 5: alieno aratro, Juv. 8, 246: marris ac vomere, id. 15, 167.—Prov.: a lasso rixam quaeri (because tired persons are easily vexed), Sen. Ira, 3, 9, 5.— With gen.: lassus maris et viarum Militiaeque, Hor. C. 2, 6, 7; cf.: ita me amor lassum animi ludificat, Plaut. Cist. 2, 1, 8.— With acc.: lassus pondus, Sen. Herc. Oet. 1599. — With inf.: nec fueris nomen lassa vocare meum, Prop. 2, 13, 28 (3, 5, 12); 2, 15 (3, 7), 46; 2, 33 (3, 31), 26.— Transf., of things: fructious assiduis lassa humus, exhausted, Ov. P. 1, 4, 14; cf.: lassa et effeta natura, Plin. Ep. 6, 21, 2: aurae spatio ipso, id. ib. 5, 6, 14: stomachus, Hor. S. 2, 8, 8: verba onerantia lassas aures, id. ib. 1, 10, 10: collum, drooping, Verg. A. 9, 436: lasso collo jumenta, Juv. 14, 146: undae, i. e. become calm again, Luc. 2, 618: mons, gently sloping, Stat. Th. 1, 330: si res lassa labat, Itidem amici collabascunt, Plaut. Stich. 4, 1, 16.—Comp., sup., and adv. seem not to occur.