The adjective form of brevity is brief, so yes.
The speech was notable more for its brevity than for its clarity.
As an adjective.
When used in a sentence the word brainy is an adjective. The brainy boy was at the top of his class.
The word "meet" is not an adjective and cannot be used as an adjective.
In the sentence "Her book is on the table," the word "her" is the possessive pronoun being used as an adjective to describe the noun "book."
No, the word "lie" is not an adjective. It can be a verb or a noun, depending on how it is used in a sentence.
a word is used to make a sentence whereas an adjective describes a noun (an object)
In the sentence "It was quite late for a telephone call," the word "quite" is an adverb used to modify the adjective "late."
it is a possessive pronoun (but used as an adjective, because it modifies a noun).
An adjective is a part of speech that is commonly called a "describing" word. An adjective is used to describe a noun in a sentence. For example, in the sentence "The sun set behind the red barn." the adjective is the word "red", and the noun it is describing is the word "barn."
An adjective, if that's what you mean. If not, sorry!
There is no adjective in that sentence. The word "fast" is sometimes used as an adjective, but in this sentence it modifies the verb "run," so "fast" is an adverb.