| frailty(noun, weakness, crack, fault, lack) |
| glitch(noun, weakness, crack, fault, lack) |
| hardship(noun, pass, difficulty, distress, failure) |
| immaturity |
| impairment |
| impecuniosity(noun, pass, difficulty, distress, failure) |
| impecuniousness(noun, pass, difficulty, distress, failure) |
| impurity |
| inaccuracy |
| inaptness(defect, deficiency, imperfection, limitation, inadequacy) |
| incapacity(defect, deficiency, imperfection, limitation, inadequacy) |
| incompetence(defect, deficiency, imperfection, limitation, inadequacy) |
| incompetency(lack, defect, deficiency, imperfection, inadequacy) |
| indigence(noun, pass, difficulty, distress, failure) |
| ineffectiveness(defect, deficiency, imperfection, limitation, inadequacy) |
| ineffectualness(defect, deficiency, imperfection, limitation, inadequacy) |
| inefficacy(defect, deficiency, imperfection, limitation, inadequacy) |
| inefficiency(defect, deficiency, imperfection, limitation, inadequacy) |
| ineptitude(defect, deficiency, imperfection, limitation, inadequacy) |
| inexactitude |