2. It can also refer to people's interest in people or things, good feelings, emotions, etc. Very low, not strong at all, not deep.
3. Source: Modern Yang Shuo's "Top of Mount Tai": "Climbing Mount Tai without seeing the sunrise is like a big drama, and the taste is a bit dull after all.
4. "In my opinion, most men are too greasy and disgusting; Some of them are too boring to arouse people's interest.