countereffective

Etymology tree
Proto-Indo-European *ḱe?
Proto-Indo-European *ḱóm
Proto-Italic *kom
Proto-Italic *kom-
Proto-Indo-European *-teros
Proto-Italic *-teros
Proto-Italic *komterosder.
Proto-Italic *komterād
Latin contrāder.
Old French contre-
Anglo-Norman countre-bor.
Middle English counter-
English counter-
Proto-Indo-European *h₁éǵʰ
Proto-Indo-European *-s
Proto-Indo-European *h₁éǵʰs
Proto-Italic *eks
Latin ex
Latin ef-
Proto-Indo-European *dʰeh₁k-
Proto-Indo-European *-yéti
Proto-Indo-European *dʰh₁kyéti
Proto-Italic *θakjō
Proto-Italic *fakjō
Latin faciō
Latin efficiō
Proto-Indo-European *-wós
Proto-Indo-European *-iHwósder.
Latin -īvus
Latin effectivusbor.
French effectifder.
English effective
English countereffective
From counter- + effective.