Think of subjective concepts as heuristics that help you describe models of the world. Evaluate those models based on their predictions. (Grounding everything in terms of predictions is a great way to keep your thinking focused. Otherwise it's too easy to go on and on about beauty or whatever without ever saying anything that actually controls your anticipations.)
Have you read the rest of 37 Ways That Words Can Be Wrong?
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.