For those familiar with Nonviolent Communication, you'll know that non-feeling words are not feelings at all. They are actually thoughts about what someone or something is doing to us. Non-feeling words do not lead us to the experience in our body that lets us understand what our feeling actually is. They lead us to a judgment of the words, actions, or thoughts of another.
What does a non-feeling sound like? If someone wags a finger at me and speaks in a loud voice, I could express a non-feeling with the sentence, 'I feel attacked' or 'I feel mistreated'.
True feelings, on the other hand, lead us to understand what our internal reaction is in the present moment. It's often a physical sensation in our body. Switching to true feelings in the example above might sound like this: 'I feel tense' or 'I feel very uneasy'.
What's the difference? In the first two (attacked and mistreated), we are thinking in terms of what the other person is doing: the thought 'He is attacking me' translates into 'I feel attacked'; the thought 'He is mistreating me' translates into 'I feel mistreated'.
In the second two, we are expressing information about our current state of being. 'I feel tense' points to a physical sensation in the body that you could probably pinpoint pretty exactly. 'I feel very uneasy' is more generalised, but still based in your present-moment bodily experience.
One quick check for if you are working with a feeling or non-feeling word is to see if adding a 'by you' (or 'by him', 'by her', 'by them', etc) makes sense. If it does make sense, you are using a non-feeling word. For example -- 'I feel attacked by you' sounds quite natural, doesn't it? But if we switch to a feeling word like 'uneasy', it doesn't make sense at all. Who would say, 'I feel uneasy by you'? Uneasy points you to a feeling.
So when you are expressing your feelings, experiment with avoiding words ending in '-ed'. Think of it as a support for you in staying connected to your true feelings. and for the people you're talking to in hearing them.