Used, like "used shirt"
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.
You can use it as an adjective.
An adjective describes a noun.
a good adjective is ugly
Yes you can use it as an adjective by saying someone is 'arachnophobic'
the adjective is captive - the noun is captivity
never
Use the suffix -ly when you want to change an adjective to an adverb. Ex: The girl is beautiful; adjective The girl spun around beautifully; adverb