1640s, "bent, curved," past-participle adjective from inflect (v.). Grammatical sense is from 1775.
his southern Yorkshire voice was less inflected and singing than her northern one
German is an inflected language
`boys' and `swam' are inflected English words
inflatable
inflate
inflation
inflationary
inflect
inflected
inflection
inflexibility
inflexible
inflexion
inflict