I don't even know if this is the correct place to post this. The only source that I'm in touch with the Japanese language is through anime. So my question, which I understand that could be kinda ...
I keep seeing these onomatopoeic adverbs popping up with the form: _っ_り. Some examples include ぐっすり、ぴったり、すっきり、etc…. Is there a name for these adverbs, and why are they in this specific form?