Deability is a term used to describe a physical or mental state of being weak or lacking in strength. DELICACY (8 letters) is a term used to describe something that is fragile or delicate. FAINTNESS (9 letters) is a term used to describe a lack of strength or energy. ENERVATION (10 letters) is a term used to describe the depletion of energy or strength. FATIGUE (7 letters) is a term used to describe a feeling of tiredness or EXHAUSTION. FEEBLENESS (10 letters) is a term used to describe a lack of strength or power. DECREPITUDE (11 letters) is a term used to describe a state of physical or mental decline due to old age. INFIRMITY (9 letters) is a term used to describe a physical or mental WEAKNESS. FRAILTY (7 letters) is a term used to describe a lack of strength or stability. DISEASE (7 letters) is a term used to describe an illness or medical condition. AILMENT (7 letters) is a term used to describe a minor illness or medical condition. EXHAUSTION (10 letters) is a term used to describe a state of extreme tiredness or FATIGUE. WEAKNESS (8 letters) is a term used to describe a lack of strength or power. Atony (5 letters) is a term used to describe a lack of muscle tone or strength. Asthenia (8 letters) is a term used to describe a general feeling of WEAKNESS or lack of energy.