ADJ [ADJ n](商人)唯利是图的，不讲诚信的 A fly-by-night businessman is someone who wants to make money very quickly, without caring about the quality or honesty of the service they offer. (商人)唯利是图的，不讲诚信的 [informal, disapproval]
...fly-by-night operators who fail to complete jobs.
不能完工的奸商
SYN unreliable, cowboy [informal], dubious, questionable