noun, feminine/ɛ̃.fiʁ.mi.te/plural: infirmités
disability, impairment; infirmity
Inherited from Middle French infirmité, borrowed from Latin īnfirmitātem. By surface analysis, infirme + -ité. See also fermeté, and the Old French forms anfermeté, enferté, which were subsequently learnedly modified to be closer to the Latin form.