The story
- Old English · inherited fromcræftiġlīċe“craftily, skillfully”
- Middle English · inherited fromcraftyly
- English todaycraftily
From Middle English craftyly, craftily, craftiliche, from Old English cræftiġlīċe (“craftily, skillfully”), equivalent to crafty + -ly.
Etymology from Wiktionary, CC BY-SA 4.0.