refined, cultured, polished
彧 centers on refinement and polish: a person or thing that is cultured, elegant, and well-developed. The meanings all point to a state of being cultivated and free of roughness.
The exact historical development of 彧 is uncertain. It appears to combine 或 with additional strokes, possibly representing decorative or refined elements, but the component origin is not clearly established.
The character looks like 或 with extra flowing strokes on the right, like decorative flourishes added to make something plain more refined and polished.
For イク, imagine a cultured person saying 'eek' at something unrefined: 'eek' -> イク, and their polished taste makes them recoil.