terminology - What do you call these words?

I'm trying to figure out what the term is that describes words that look like this:

やっぱり；　さっぱり；　うっかり；　こっそり；　ひっそり；　ぐっすり；　すっきり

They seem similar to 擬態語、義質語、and　擬音語, but I think they have a separate classification...

Is there a term that describes words like this? (Please let me know if this has already been asked). If there is not a term, how would one talk about these adverbs in Japanese? If I needed to state that "I have problems remembering (these types) of adverbs", how would one go about explaining that?

Answer

They are called adverbs. Among them, やっぱり and うっかり are called sentential adverbs, and are independent of the core event described by the predicate. さっぱり, ひっそり, ぐっすり, and すっきり are called manner adverbs, and are directly tied to the core event described by the predicate. I am not sure which group こっそり belongs to.