Low-key and Subfusc

Low-key adjective - Not excessively showy.

Subfusc and low-key are semantically related. In some cases you can use "Subfusc" instead an adjective phrase "Low-key".

Subfusc adjective - Devoid of brightness or appeal.

Low-key and subfusc are semantically related. Sometimes you can use "Low-key" instead an adjective "Subfusc".