No, it is not. It is a noun meaning a particular set of physical conditions, natural or artificial. It can also mean the entire natural world or biosphere. The adjective form is environmental.
The word "hydrobiological" is an adjective. It describes something related to the study of aquatic life in freshwater environments.
No, it is a verb or a noun (to go around, to surround; a round shape). The adjective form is circular.
It is an adjective.It is a an adjective.
Cautious IS an adjective. An adjective is an action!
An adjective
it is an adjective!
No. It is not an adjective. An adjective describes something.
No, it is an adverb. The adjective is clumsy.
It can be. "Ideal" is an adjective and a noun.
No it's not a adjective, an adjective is a describing word.
adjective
No, it is not an adjective; it is an adverb. The adjective form is "awkward."