Low-down and Let down

Low-down adjective - Not following or in accordance with standards of honor and decency.

Let down and low-down are semantically related. in depressed topic. In some cases you can use "Let down" instead an adjective phrase "Low-down", when it comes to topics like discouraged.

Let down verb - To fall short in satisfying the expectation or hope of.

Low-down and let down are semantically related. Sometimes you can use "Low-down" instead an adjective "Let down".