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Stuffy is an adjective
How stuffy is the weather today. Cloudness and hot temperature make the weather stuffy.
close or muggy
The room felt hot and stuffy. My nose was stuffy, my head hurt, and I ached all over because I had a cold.
The joint of the hind leg analogous to the human knee
yes.
Well, basically stuffy means packed like when your nose is stuffy. Stuffy can also mean a stuffed animal. Sometimes people call stuffed animals stuffies.
The word hotter is an adjective. It means to be more hot.
Adjectives that are synonyms for prim can include demure, formal, proper, prudish, or stuffy. The last two have negative connotations (too stiff, rigid, or stern).
The word "close" can have all those meanings:Close the window. (to shut)I want to close my speech with a positive outlook. (to end)The room felt so close, he had to leave to get some fresh air. (hot and stuffy)The pronunciation of the 's' in the first two (verbs) is a 'z' sound.The 's' in the last example (adjective) is an 's' sound.
the air conditioning is broken
No not really. Sometimes in summer it can be very warm and sultry/stuffy.