No.
"Original" is an adjective, not an adverb. The comparative form is "more original". The adverb is "originally" and the comparative of that would be "more originally".
The word ''meanwhile'' is an adverb itself!
Happy is an adjective. The adverb form is happily. The comparative adverb form is more happily, and the superlative is most happily. When a comparative has two syllables as in happy, in most cases it can be used two ways (1) happier, or (2) more happy. Either way is correct. However, the -LY adverb forms must use "more" and "most" to express the comparative and superlative.
adverb = something that describes a verb. e.g. (Verb = snoring) (Adverb used with verb = heavily snoring) or (Verb = Kick) (Adverb used with verb = kick vigorously)
The adverb form is "easily" and the comparative is "more easily."
It can be an adverb but is more often an adjective. The adverb is used primarily with the verb "stand."
One adverb (rarely used) is agreeingly.An adverb more frequently used is agreeably, from the related adjective agreeable.
The two participles are adjectives (interested and interesting) but the adverb interestingly is much more used than the adverb interestedly.
No. It is a noun, or more rarely used as a verb, or an adjective (gutter language). There is no adverb form.
No. The word "not" is an adverb, or more rarely a noun.
The word "after" can be an adverb, but it is most commonly used as a preposition or a conjunction. The more common adverbs are "afterwards" and "thereafter." After is more commonly an elliptical adverb: "I left before lunch, and came back after."
The adverb form would be "freakily" which is very rarely used.The similar adjective freakish and the adverb freakishly are more often used.
No. Salty is an adjective. The adverb "saltily" is more often used to mean (spoken) in coarse or racy language.
Yes, it can be an adverb. But it is more commonly used as a preposition (in the intervening time), or a conjunction (meaning because, or inasmuch as).
One adverb related to agreement is "agreeably." It means in an agreeable or amicable manner.It is used more frequently than the other adverb form, which is agreeingly.
The past participle adjective surprised has the seldom used adverb form surprisedly. Much more common is the adverb form of the present participle (surprisingly), which may be used incorrectly to mean surprisedly.
Tasty is an adjective. Taste would be the verb.