It could be used to describe a noun. Such as: The professor was the department head. However, in most cases it will be used as a noun on its own.
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Cautious IS an adjective. An adjective is an action!
The word "it" is not an adjective (it is a pronoun). A word is an adjective if it modifies (defines, characterizes) a noun or pronoun. The big tent - big is an adjective He is tall - tall is an adjective This key - this (while arguably called a determiner) is a demonstrative adjective
probable is an adjective
Hard is an adjective.
Stable is an adjective.