No.
The adjective "open" could be used to describe a mouth that is not closed.
An adjective would be used to describe a noun.
The adjective "rippling" can be used to describe waves.
"Beautiful" is a common adjective used to describe lilies.
'Friendly' is an adjective because you'd use it to describe someone. Any word that can be used to describe someone (a noun) is an adjective.
Wet can be used as an adjective. It can also be used as a verb to describe an action.
adjective
Yes, sorrowful is an adjective because it can be used to describe something.
Yes, careless is an adjective, a word used to describe a noun.
No. It is a noun. It is never used as an adjective to describe another noun.
The word wily is an adjective. It is used to describe someone who is cunning.
"Searing" is an adjective that can be used to describe intense heat.