Synonyms for frailty

noun

1. Quality of being weak

   fragility, weakness, debility, delicacy, infirmity, feebleness, decrepitude, daintiness, puniness, slightness, frangibility, susceptibility, brittleness, softness, flaccidity, unsubstantiality, flimsiness, limpness, shakiness, wobbliness, rustiness.

   Antonyms strength*, indestructibility, firmness.

2. A moral or social weakness

   failing, foible, imperfection; see defect 2, fault 2.