The word 'take' is a verb and a noun.
A noun can function as an adjective called an attributive noun (or a noun adjunct).
For example, the compound nouns 'take out' and 'take away' use the noun 'take' as an attributive noun.
I am going to take a brief break for lunch.
I take it you mean school. It could be. It depends on how you use it. school books for example
You could use it like "The sublime weather made me want to take a spontaneous bike ride!"
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).
Happy is already an adjective.
Yes, you can use the adjective dramatic.
Yes, It Almost Has The Meaning As The Adjective.
Yes, the term 'untidy clothes' is a correct use of the adjective.
"Obsolete" is an adjective. It describes something that is no longer in use or outdated.
a good adjective is ugly
the adjective is captive - the noun is captivity
Yes you can use it as an adjective by saying someone is 'arachnophobic'