smelly
Airy
By a virus adjective
No it is not. Somewhat is not logical in use to go on to a new idea. Somewhat is usually used as an adjective's adjective. (sorry I don't know what the correct term for that is) Example: I walked out of my house into the somewhat cold air. Cold is the adjective, somewhat is being used to describe the adjective.
No it's a noun
Her rueful song quivered through the air as she knelt down and shook her fists at the sky.
The adjective form of "surface" is also surface. We generally use it to describe something that is meant to be carried out via land or sea and NOT via air. We might say "surface mail" or "surface transportation."
Happy is already an adjective.
Yes, you can use the adjective dramatic.
The adjective form for the verb to use is the past participle, used (a used car).The adjective form for the noun use is useful(useful information).
Yes, It Almost Has The Meaning As The Adjective.
Yes. It refers to not allowing air in or out.
Yes, the term 'untidy clothes' is a correct use of the adjective.