inadvisable

Etymology tree
Proto-Indo-European *né
Proto-Indo-European *n̥-
Proto-Italic *n̥-
Latin in-bor.
Middle English in-
English in-
Proto-Indo-European *h₂éd
Proto-Italic *ad
Latin ad
Old French a
Proto-Indo-European *weyd-
Proto-Indo-European *-éh₁ti
Proto-Indo-European *-yeti
Proto-Indo-European *-éh₁yeti
Proto-Indo-European *widéh₁yeti
Proto-Italic *widēō
Latin videō
Latin vīsus
Old French vis
Old French avis
Old French aviserbor.
Middle English avisen
▲
Proto-Italic *ad
Proto-Italic *ad-
Latin ad-
Proto-Indo-European *weyd-
Proto-Indo-European *-(h₁)seti
Proto-Indo-European *wéydseti
Proto-Italic *weidsō
Latin visō
Late Latin advisōder.
English advise
Proto-Indo-European *-tḗr
Proto-Indo-European *-dʰlom
Proto-Indo-European *-dʰlis
Proto-Italic *-ðlis
Latin -bilis
Latin -ābilis
Old French -ablebor.
Middle English -able
English -able
English advisable
English inadvisable
From in- + advisable.