unrueful

Etymology tree
Proto-Indo-European *né
Proto-Indo-European *n̥-
Proto-Germanic *un-
Proto-West Germanic *un-
Old English un-
Middle English un-
English un-
Proto-Germanic *hrewwaną
Proto-West Germanic *hreuwan
Proto-Indo-European *-h₂
Proto-Indo-European *-éh₂
Proto-Germanic *-ō
Proto-West Germanic *-u
Proto-West Germanic *hreuwu
Old English hrēow
Middle English rewe
Proto-Indo-European *pleh₁-
Proto-Indo-European *-nós
Proto-Indo-European *pl̥h₁nós
Proto-Germanic *fullaz
Proto-Germanic *-fullaz
Old English -ful
Middle English -ful
Middle English reuful
English rueful
English unrueful
From un- + rueful.