discomfort; displeasure; unpleasant feeling
A general feeling of physical or mental unease, annoyance, or displeasure. Often used in formal or written contexts.
I felt displeasure at his attitude.
The smell in this room causes discomfort.
不快感 is a milder, broader sense of discomfort or displeasure, whereas 嫌悪感 is a stronger, often morally-charged revulsion.
不快感 is the noun for an unpleasant feeling, the direct opposite of 快感's pleasant sensation.
Compound of 不快 (discomfort, unpleasantness) + 感 (feeling, sensation).