The story
- Proto-Germanic*skamō
- Proto-West Germanic*skamu
- Old Englishsċamu
- Proto-Indo-European*pleh₁-
- Proto-Indo-European*pl̥h₁nós
- Proto-Germanic*fullaz
- Old Englishsċeomfull
- Middle Englishschameful
- Proto-Indo-European*leyg-
- Proto-Germanic*līką
- Middle Englishschamefully
- English todayshamefully
Inherited from Middle English schamefully. By surface analysis, shameful + -ly.
Etymology from Wiktionary, CC BY-SA 4.0.