Double-dealing and Fly-by-night

Double-dealing adjective - Marked by, based on, or done by the use of dishonest methods to acquire something of value.

Fly-by-night and double-dealing are semantically related In some cases you can use "Fly-by-night" instead an adjective phrase "Double-dealing".

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

Double-dealing and fly-by-night are semantically related in dishonest topic. Sometimes you can use "Double-dealing" instead an adjective phrase "Fly-by-night".