inadept

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
Proto-Italic *ad-
Latin ad-
Latin apiō
Proto-Indo-European *-sḱéti
Proto-Italic *-skō
Latin -scō
Latin apīscor
Latin adipīscor
Latin adeptusbor.
French adeptebor.
English adept
English inadept
From in- + adept.