あつ
atsusa

Noun

1. heat (of the weather); hotness

そのあつさで気絶きぜつして、気がついたら救命きゅうめいいかだのなかにいた。
sono atsusade kizetsu shite kigatsuitara kyūmēikadano nakani ita.
I fainted from the heat, and when I came to, I was in a life raft.