The word 'manner' is an abstract noun, a word for a way of acting or a way something is done; a habit or custom; social conduct, behavior; a word for a concept.
The word extremely is an adverb. It is really an adverb of quality or manner. Adverbs of quality or manner always answer the question 'how'.
Loftily is an adjective and means, "in a pompous, arrogant or grand manner"
Carefully is an adverb, based on the adjective careful. It means done in a careful manner.
"Great", "greater", and "greatest" are all adjectives, more particularly the normal, comparative, and superlative degrees of the root adjective "great".
Yes, it can be an adjective. It is the past tense and past participle of the verb "welcome" which is also a noun.
No, since manner is only a noun, any word that modifies it is an adjective. However, well is an adverb when modifying the adjective mannered.
The adverb form for the noun manner is mannerly, which is also an adjective.
No: Tremendous is an adjective, whereas tremendously is an adverb (of manner), the difference being that adjectives only modify nouns, while adverbs can modify other grammatical constructs. Tremendously is an adverb of manner, which modifies an adjective.
Magically is an adverb. It means in a magical manner. Magical is the adjective form.
It certainly can be used in that manner, yes.
Yes, it is. It means in a loud or noisy manner.
Yes, it is an adverb. It means in a through manner. It should not be confused with "exhaustingly" (in a tiring manner).
The adjective would be derisive (in a manner mean to deride or insult) or the participle, deriding, meaning about the same.
Yes, it is an adjective. It means in a cooperative or agreeable manner.
The word "firmly", meaning "in a firm manner", is an adverb.
Hurriedly is an adjective of manner. It tells how an action was performed (in this case, in a hurried or hasty manner).
No, terrifying is an adjective. The adverb form is "terrifyingly" (in a very scary manner).