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His infirmity made it difficult for him to climb the stairs.
His physical weakness made it hard for him to climb the stairs.
a physical or mental weakness or disability
Age often brings infirmity, requiring more medical care.
As people get older, they often develop physical weaknesses that need medical attention.
Often used in formal or medical contexts to describe chronic conditions.
Use 'infirmity' in formal or medical writing to describe chronic conditions.
From Old French 'enfermeté' (weakness), from Latin 'infirmitas' (weakness), from 'infirmus' (weak).
Often used in formal or medical contexts to describe chronic conditions or disabilities. Avoid using it to describe temporary illnesses.