Flimflam and Fly-by-night

Flimflam noun - A clever often underhanded means to achieve an end.

Fly-by-night and flimflam are semantically related. In some cases you can use "Fly-by-night" instead an adjective "Flimflam".

Fly-by-night adjective - (of businesses and businessmen) unscrupulous.

Flimflam and fly-by-night are semantically related. Sometimes you can use "Flimflam" instead an adjective phrase "Fly-by-night".