English
infirmness
From infirm + -ness.
Formed from infirm + -ness
Proto-Italic *en- ‘in, into, in-’
Latin firmus ‘strong, firm’
Latin infirmus ‘weak, feeble’
Middle English infirme
English infirm
Today it means
noun The quality of being infirm; feebleness or illness.
Language periods are conventional ranges, not dates for this word.
Etymograph / infirmness