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Definition of infirmity : 1. A personal frailty or failing; foible; eccentricity; a weakness or defect.
2. The state of being infirm; feebleness; an imperfection or weakness; esp., an unsound, unhealthy, or debilitated state; a disease; a malady; as, infirmity of body or mind.

Synonyms:

ill, unsubstantiality, foible, better, shortcoming, health, vice, puniness, fault, distemper, help, delicateness, strong, delicacy, unsoundness, weakliness, ailing, failing, insubstantiality, confinement, fragileness, weak point, valetudinarianism, tenuity, affliction

disease (part of speech: noun)

disease, ague, feverishness, complication, condition, spasm, nausea, infliction, symptom, affection, virus, apoplexy, complaint, sickness, breakdown, syndrome, bug, handicap, queasiness, ailment, illness, attack, malaise, curse, unhealthiness, disability, disorder, debility, sickliness, decrepitude, malady, collapse, indisposition, pestilence, infection, fever

irresolution (part of speech: noun)

impulsiveness, vacillation, changeability, insipidity, indecisiveness, unsureness, hesitance, double-mindedness, uncertainty, ambivalence, spinelessness, irresolution, shyness, capriciousness, yellowness, volatility, tentativeness, wateriness, shiftiness, halfheartedness, fickleness, unwillingness, inconsistency

weakness (part of speech: noun)

deficiency, anemia, impotence, frailty

feebleness (part of speech: noun)

flimsiness, powerlessness, debilitation, weakness, frailness, feebleness, faintness, softness, fragility, ricketiness

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