airworthiness

Etymology tree
Proto-Indo-European *h₂ews-
Proto-Indo-European *h₂ewsér
Proto-Hellenic *auhḗr
Ancient Greek ᾱ̓ήρ (āḗr)bor.
Latin āēr
Old French airbor.
Middle English aire
English air
English -worthy
English airworthy
Proto-Germanic *-in-
Proto-Indo-European *-h₂
Proto-Indo-European *-éh₂
Proto-Indo-European *-yéti
Proto-Indo-European *-eh₂yéti
Proto-Indo-European *-h₂ti
Proto-Germanic *-ōną
Proto-Germanic *-inōną
Proto-Indo-European *-dyé-
Proto-Germanic *-atjaną
Proto-Indo-European *-tus
Proto-Germanic *-þuz
Proto-Germanic *-assuz
Proto-Germanic *-inassuz
Proto-West Germanic *-nassī
Old English -nes
Middle English -nesse
English -ness
English airworthiness
From airworthy + -ness.