Infirmity - Vine's Expository Dictionary of New Testament Words
Infirmity
[ 1,,G769, astheneia ]lit., want of strength" (a, negative, sthenos, "strength"), "weakness," indicating inability to produce results, is most frequently translated "infirmity," or "infirmities;" in Romans 8:26, the RV has "infirmity" (AV, "infirmities"); in 2 Corinthians 12:5, 2 Corinthians 12:9-10, "weaknesses" and in 2 Corinthians 11:30, "weakness" (AV, "infirmities"); in Luke 13:11 the phrase "a spirit of infirmity" attributes her curvature directly to satanic agency. The connected phraseology is indicative of trained medical knowledge on the part of the writer.
[ 2,,G771, asthenema ]
akin to No. 1, is found in the plural in Romans 15:1, "infirmities," i.e., those scruples which arise through weakness of faith. The strong must support the infirmities of the weak (adunatos) by submitting to self-restraint.
Note: In Luke 7:21, AV, nosos, "a disease," is translated "infirmities" (RV, "diseases").