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Related to bush league: bush leaguer
slang Subpar or inept; lame. The phrase comes from minor league baseball, in which some teams played on unkempt fields bordered by bushes, or in rural, "bush" towns. Primarily heard in US. Their operation is pretty bush league—no professionalism at all. The way you just let that forward go around you and score was bush league, dude—show some effort and play harder!
bush league(American informal)
not done to the usual or accepted standards His article was a bush league stunt to discredit the company, and he has apologized.
Anything amateurish or otherwise below professional caliber. Baseball teams have been divided into two broad categories. Major league teams, also known as the big leagues, have the most professional players who play in state-of-the-art stadiums. Then there are minor league teams, composed of players on their way up or down the baseball ladder and ballparks that range in quality from almost-major league to close-to-sandlot. The latter fields, especially those in rural areas, weren't always enclosed by fences; instead they had shrubbery around their perimeters. Hence the phrase “bush league,” where the level of play was far from major league ability. The expression quickly spread to any endeavor that was less than expertly done.