Crafty

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Old English cræftig ‘strong, powerful’, later ‘skilful’ (see craft, -y1).

wiktionary

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From Middle English crafti, crefti, from Old English cræftiġ(“ingenious; skilful; crafty; cunning; virtuous; powerful”), from Proto-Germanic *kraftagaz, *kraftugaz(“powerful”), equivalent to craft +‎ -y. Cognate with Saterland Frisian kräftich, West Frisian krêftich, Dutch krachtig, German Low German krachtig, German kräftig.

etymonline

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crafty (adj.)

mid-12c., crafti, "skillful, clever, learned," from Old English cræftig "strong, powerful," later "skillful, ingenious," acquiring after c. 1200 a bad sense of "cunning, sly, skillful in scheming," the main modern sense (but through 15c. also "skillfully done or made; intelligent, learned; artful, scientific"); see craft (n.) + -y (2). Perhaps to retain a distinctly positive sense, Middle English also used craftious as "skillful, artistic" (mid-15c.). Related: Craftily; craftiness.