1. lacking proper training, skill, or qualifications; amateur or incompetent
Usage: informal

1. a person who lacks proper training or qualifications in their work
Usage: informal

Examples

• The homeowner regretted hiring that jackleg electrician after the wiring failed.
• Don’t trust a jackleg mechanic with your expensive car.
• The jackleg carpenter’s shoddy work was obvious to everyone.
• She called him a jackleg lawyer who couldn’t win a simple case.
• The jackleg plumber made the leak worse instead of fixing it.
• That jackleg contractor left the job half-finished.