Old English
[edit] Alternative forms
* felo, felu, fæle
[edit] Etymology
Proto-Germanic *fali- (“wicked, cruel”). Akin to Old Frisian fal, Old Dutch fel "cruel, wrathful, bad, base", Danish fæl "hideous, disgusting, ghastly, grim".
[edit] Adjective
fel
1. cruel, wicked
2. fierce, savage
Works for me.