unimpressively

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-Indo-European *h₁én
Proto-Italic *en
Proto-Italic *en-
Latin in-
Proto-Indo-European *per-?
Proto-Indo-European *pres-der.
Proto-Italic *pres-
Latin premō
Latin imprimō
Latin impressusder.
Middle English impressen
English impress
Proto-Indo-European *-wós
Proto-Indo-European *-iHwósder.
Latin -īvus
Old French -ifbor.
Middle English -yf
English -ive
English impressive
English unimpressive
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 unimpressively
From unimpressive + -ly.