invalidus (not strong, ineffectual, inefficacious; opposed to fortis and valens): imbecillus (weak; of persons; especially of invalids and old persons: then, also, of food, drink, etc.; opposed to firmus, fortis, and valens: ☞ imbecillus is a late form): infirmus (without firmness and strength; opposed to firmus): debilis (crippled): iners (without energy, life, or motion; of persons and of things): exsanguis (lifeless): enervatus (unnerved, exhausted, PROP., of persons; with velut prefixed also, of ihe state): jejunus (poor, dry; of land, style of a speech and the speaker): languidus (feeble): irritus (invalid; opposed to ratus). To be powerless, invalidum, etc., esse; deficiunt mihi vires (strength fails me): to make or render powerless, vires, or nervos, or vires et robur frangere, nervos incidere, debilitare (to weaken): irritum reddere (to invalidate): to become powerless, vires amittere.