The story
- Proto-Indo-European*h₂éd
- Proto-Italic*ad
- Proto-Italic*ad-
- Latinad-
- Proto-Italic*kaussā
- Old Latincaussa
- Latincausa
- Latinaccūsō
- Latinaccūsābilis
- English todayaccusable
Borrowed from Latin accūsābilis (“accusable”), corresponding to accuse + -able; compare French accusable.
Etymology from Wiktionary, CC BY-SA 4.0.