The crossword solution for the term 'Like Yin but not Yang' is DARK, which has 4 letters. The term 'Yin and Yang' is a Chinese philosophical concept that describes two opposite forces that are interconnected and interdependent in the natural world. Yin is characterized as being DARK, passive, and feminine, while Yang is bright, active, and masculine. Therefore, the answer to the crossword clue 'Like Yin but not Yang' is DARK, as it is the opposite of Yang.