[v1 stem] + にくい [v5 stem (連用形)] + にくい [する → し] + にくい [来る → き] + にくい
The suffix ~にくい is used to express that something is difficult or hard to do. It attaches to the stem of a verb to describe actions that require effort, are troublesome, or are inconvenient to perform.
The opposite structure is ~やすい, which indicates ease of performing an action.