Stuffy (adjective)

1. Having a stuffy or stuffy feeling; close, stuffy air.
2. Having an airless or close atmosphere; a stuffy room.
3. Having a blocked nose.

Origin:

From the middle english word "stufy", meaning "clogged with smoke".

Examples:

1. The room was stuffy and hot, making it hard to breathe.
2. I woke up with a stuffy nose and a headache.
3. After sitting in traffic for an hour, the car was stuffy and we had to open the windows.
4. The old building had a stuffy smell because it hadn't been aired out in years.
5. The party was stuffy and formal, with guests dressed in formal attire.