The word "完全" is formed by combining the character "完", meaning "complete" or "finished", which is composed of the radical "宀" (roof) and the component "元" (origin), implying a sense of bringing something to its end or perfection, with the character "全", meaning "whole" or "entire", historically derived from "入" (enter) and "玉" (jade) or later interpreted as "人" (person) under "王" (king), conveying the idea of intactness or totality. Together, these characters semantically reinforce each other to create the meaning of "complete" or "whole".