What does 希薄 mean?
希薄 is a Japanese adjective meaning “thin (air); weak (liquid); dilute; sparse (population)” in English. It can also be translated as “lacking (enthusiasm, consideration, substance, etc.)” depending on context. It is written as 希薄 in kanji, きはく in hiragana, and kihaku in romaji. This word is part of JLPT N1 vocabulary.
Example sentence
高く登るにつれて、空気は希薄になる。
As you go up higher, the air becomes thinner.