(adjective) : in-vălĭdus, a, um
* Not strong, infirm, impotent, weak, feeble (not in Cic. or Caes.).
* Lit.: Camillus, jam ad munera corporis senectā invalidus,Liv. 6, 8: milites,id. 23, 16: paucos graves aetate aut invalidos inveniunt,id. 10, 34 fin.: ad ingrediendum,Gell. 20, 1, 11: corpus laborum impatiens invalidumque,Ov. Tr. 5, 2, 4: manus,Luc. 5, 275: quidquid tecum invalidum metuensque pericli est,Verg. A. 5, 716: pueri,Val. Fl. 5, 24; (with inermis),Tac. A. 1, 46: corpus,Ov. H. 21, 297: artus,id. ib. 21, 245.—Comp.: invalidiores Parthi,Just. 41, 6, 3.—Sup.: invalidissimum urso caput,Plin. 8, 36, 54, § 130.
* Transf., weak, inefficient, inadequate, unsuitable: stationes pro castris,Liv. 41, 2: invalida moenia adversum irrumpentes,Tac. A. 12, 16: invalidae ad hoc monstrum sugillandum litterae,Val. Max. 5, 3, 4: defensionis praesidia,id. 8, 1, 3: venenum,Claud. Cons. Mall. Theod. 170: causa,Luc. 7, 67: argumentum,Dig. 48, 18, 1: ignes,low,Tac. A. 1, 65: fama,inadequate, depreciating,Amm. 16, 10, 17.—Adv.: invălĭdē, weakly, feebly, Arn. 7, 250.

s. TLL