The word 厌烦 is formed by combining two characters that each convey a facet of a closely related emotional experience. 厌 expresses a sense of being fed up, weary, or disgusted with something, carrying a connotation of saturation and rejection. 烦 conveys irritation, vexation, or mental annoyance, often from something persistent or bothersome. When paired, they create a compound idea where deep weariness (厌) intertwines with active agitation (烦), resulting in the encompassing feeling of being thoroughly sick of and impatient with a person, situation, or activity.