Wiktionary
a. 1 (context US English) amateur, untrained, incompetent 2 (context US English) dishonest, unscrupulous n. A type of drill operated by means of compressed air.
Wikipedia
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Usage examples of "jackleg".
They both headed down that way, each getting a large cup of coffee at the Starbucks as a jackleg disguise.
It was cut and try, with a literal infinity of choices and just a few jackleg estimates to rule out some of the possibilities.
Batbaian, a skillful jackleg tailor, sewed scraped sheepskins together into cloaks the two wanderers wore over their greatcoats.
Brightblade, not some outlander tricked up like a jackleg executioner.
He remembered Gerry, smeared up to the elbows with oil and ink, the very image of a hillbilly jackleg mechanic.
In recent years, various Montoyas had become famous as jackleg mechanics.
His boysthe real deputies, the part-timers, the wannabes, the jackleg constables with homemade uniformsthey all got quiet and gave me their sneers.
Trev Dawson was a pretty good jackleg carpenter, and he showed us how to cut some more windows along the side, and damned if Alan Snopes didn't come up with panes of glass for them that were different colors - sort of a cross between carnival glass and the sort you see in church windows.
You can't learn all the basic manual trades in your spare time in a limited number of years but you can acquire a jackleg but adequate knowledge of the more important ones, in the time we have left.