Discomfort was a feeling of mental unease, worry, embarrassment, or a lack of ease and comfort.
In 2366, Kurn said to the Starfleet crew, "I find the constraints a bit difficult to conform to. Just a short while ago, I had to stop myself from killing Commander Riker. I believe he was trying to communicate the crew's sense of discomfort with my style of command. Under different circumstances, I would consider that a challenge to my authority." (TNG: "Sins of The Father")