Terribly...
terrible
No, it's an adjective. The adverb form is terribly.
manner
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'.
The adverb form is "angrily" (in an angry manner).
The word patiently is an adverb (in a forbearing or unworried manner).
The word "constantly" is an adverb. It is used to describe the frequency or manner in which an action is done.
The word swiftly is an adverb. It means in a swift manner.
No, the word confident is not an adverb. This word is an adjective.The adverb form of the word is confidently.
The word 'briskly' is an adverb, a word that modifies a verb, an adjective, or another adverb as in a quick and lively manner. The word briskly is the adverb for of the adjective brisk.
The word regularly is an adverb. It means to do something in a regular manner.
No. The word thrifty is an adjective. The adverb form is "thriftily" (an a thrifty manner).