inauthoritative

Etymology tree
Proto-Indo-European *né
Proto-Indo-European *n̥-
Proto-Italic *n̥-
Latin in-bor.
Middle English in-
English in-
Proto-Indo-European *h₂ewg-der.
Proto-Indo-European *h₂owg-éye-ti
Proto-Italic *augejō
Proto-Italic *augeō
Latin augeō
Proto-Indo-European *-tōr
Proto-Italic *-tōr
Latin -tor
Latin auctor
Proto-Indo-European *-teh₂
Proto-Indo-European *-ts
Proto-Indo-European *-teh₂ts
Proto-Italic *-tāts
Latin -tās
Latin auctōritāsbor.
Old French autoritébor.
Middle English auctorite
English authorit(y)
Proto-Indo-European *-h₂
Proto-Indo-European *-éh₂
Proto-Indo-European *-tós
Proto-Indo-European *-eh₂tos
Proto-Italic *-ātos
Latin -ātuslbor.
English -ate
Proto-Indo-European *-wós
Proto-Indo-European *-iHwósder.
Latin -īvus
Old French -ifbor.
Middle English -yf
English -ive
English -ative
English authoritative
English inauthoritative
From in- + authoritative.