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
- English todayshameful
From Middle English schameful, schamfull, from Old English *sċeamfull, sċeomfull, equivalent to shame + -ful. Cognate with Danish skamfuld (“shameful, shamefast, ashamed”).
Etymology from Wiktionary, CC BY-SA 4.0.