The word "愚昧" is formed by combining the character "愚", meaning foolish, which itself is composed of "禺" as a phonetic component and "心" (heart/mind) to indicate a foolish mind, with the character "昧", meaning ignorant, composed of "日" (sun) and "未" (not yet) to imply darkness or lack of light, metaphorically ignorance, thus together conveying the concept of ignorance or stupidity.