counterproductively

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 *per-der.?
Proto-Indo-European *per-der.?
Proto-Indo-European *pér
Proto-Indo-European *-o
Proto-Indo-European *pró
Proto-Indo-European *pro-
Proto-Italic *pro-
Late Latin prō-
Proto-Indo-European *dewk-
Proto-Indo-European *déwkti
Proto-Italic *doukō
Late Latin dūcō
Late Latin prōdūcō
Proto-Indo-European *-wós
Proto-Indo-European *-iHwósder.
Late Latin -īvus
Late Latin prōductīvusbor.
English productive
English counterproductive
Proto-Indo-European *leyg-der.
Proto-Germanic *līkąder.
Proto-Germanic *-līkaz
Proto-Germanic *-ê
Proto-Germanic *-līkê
Proto-West Germanic *-līkē
Old English -līċe
Middle English -ly
English -ly
English counterproductively
From counterproductive + -ly.