暗さ（くらさ、kurasa）
- darkness

The word 暗さ (くらさ) means "darkness," "gloom," "obscurity," or "dimness." It refers to the state of being dark or the quality of something lacking light. This noun specifically describes the degree or extent of darkness. It can apply to physical darkness, like the absence of light in a room, or metaphorical darkness, such as a feeling of sadness or a situation of uncertainty. It's the noun form of the adjective 暗い (くらい), which means "dark" or "gloomy." The suffix "-さ" (-sa) transforms an adjective into a noun, indicating the "degree" or "state" of the adjective's quality.

⚫︎ 部屋の暗さ Translation: The darkness of the room. ⚫︎ あの映画の暗さが印象的だった Translation: The gloominess of that movie was impressive. ⚫︎ 不安の暗さに包まれた Translation: Wrapped in the darkness of anxiety.

暗さ is used to describe the degree or quality of darkness or gloom. You can use it when talking about the lack of light, a sad or depressing atmosphere, or something that is obscure or unclear. It's often used in descriptive writing or when expressing feelings or impressions. It is usually more formal or literary compared to just saying 暗い.

暗さ is written in hiragana as くらさ. The kanji form 暗さ is also possible, with 暗 (an) meaning "dark" and "-さ" (sa) representing the noun-forming suffix. There are no variations in okurigana.

⚫︎ 闇 (やみ) - darkness, the dark. ⚫︎ 暗黒 (あんこく) - darkness, the dark. ⚫︎ 薄暗さ (うすくらいさ) - dimness, faint light. ⚫︎ 陰 (かげ) - shadow, shade, darkness (can be metaphorical).

⚫︎ 明るさ (あかるさ) - brightness, light. ⚫︎ 光 (ひかり) - light. ⚫︎ 輝き (かがやき) - radiance, shine.

この部屋の暗さは、落ち着かない感じがする。 ・Translation: This room's darkness makes me feel uneasy. ・Explanation: The sentence describes how the degree of darkness in the room affects the speaker's feelings.

彼女の言葉には、暗さと孤独が感じられた。 ・Translation: Her words conveyed a sense of gloom and loneliness. ・Explanation: This sentence uses 暗さ to describe the emotional tone expressed by her words, indicating a feeling of sadness.

The word 暗さ is derived from the adjective 暗い (くらい), meaning "dark." The suffix "-さ" (-sa) is a common grammatical element used in Japanese to transform an adjective into a noun, representing the "state" or "degree" of the adjective's quality. In essence, it captures the abstract concept of "darkness" itself.