The term 'quality evoking sadness' can be summarized as PATHOS, which is a six-letter word. PATHOS is an emotional appeal that is used to evoke feelings of pity, sympathy, and sorrow in an audience. It is often used in literature, film, and other forms of media to create a sense of empathy in the viewer or reader. PATHOS is a powerful tool for creating a strong emotional connection between the audience and the subject matter.