exceptionless

Etymology tree
Proto-Indo-European *h₁éǵʰ
Proto-Indo-European *-s
Proto-Indo-European *h₁éǵʰs
Proto-Italic *eks
Latin ex
Latin ex-
Proto-Indo-European *kap-
Proto-Indo-European *-yéti
Proto-Indo-European *kapyéti
Proto-Italic *kapjō
Old Latin kapiō
Latin capiō
Latin excipiō
Proto-Indo-European *-tis
Proto-Indo-European *-Hō
Proto-Indo-European *-tiHō
Proto-Italic *-tiō
Latin -tiō
Latin exceptiōder.
Old French excepcion
Anglo-Norman excepciounbor.
Middle English exception
English exception
Proto-Indo-European *lewh₁-
Proto-Indo-European *lewHs-der.
Proto-Germanic *leusaną
Proto-Germanic *lausaz
Proto-Germanic *-lausaz
Proto-West Germanic *-laus
Old English -lēas
Middle English -les
English -less
English exceptionless
From exception + -less.