プログレッシブ和英中辞典(第4版)の解説
くらさ【暗さ】
&fRoman1;darkness
暗さがつのった
It became darker and darker.
暗さは暗し，何も見えなかった
I could see nothing in the utter darkness.
&fRoman2;〔陰気〕
あの暗さがなかったらだれからも好かれるのに
If she didn't have that gloomy [morose] nature, she would have been liked by everyone.