蒸し暑い

1. Origins, structure, and basic meaning

• Structure: 蒸し暑い is read むしあつい and is an adjective meaning hot and humid or muggy.
• Basic usage: It describes the air in a room after rain or on a hot, humid night.

2. Common pitfalls and similar expressions

• Before a noun and in the past
  • It directly modifies a following noun, as in 蒸し暑い夜. A past state is expressed by changing final い to かった, as in 蒸し暑かった.