The kanji 曇 means "cloudy," "overcast," or "to become cloudy." It directly relates to the presence of clouds obscuring the sun and making the sky appear less bright. It signifies a lack of clear visibility or a gloomy atmosphere.

・On-yomi (音読み): ドン (don) ・Kun-yomi (訓読み): 曇（くも） (kumo)

⚫︎ 曇（くも）り空（ぞら） Translation: Cloudy sky ⚫︎ 曇（くも）ったメガネ Translation: Foggy glasses (lit. "clouded glasses") ⚫︎ 今日は曇（くも）っていますね。 Translation: It's cloudy today, isn't it?

The kanji 曇 is a 形声文字 (keisei moji), which means "phonetic-semantic compound character." The left side, 日 (hi), is the radical and means "sun" or "day." The right side, 雲 (kumo), means "cloud." Therefore, the formation of 曇 combined the meaning of "sun" and "cloud," symbolizing the sun being obscured by clouds, hence "cloudy."