na-adjective, adverb, noun, noun or participle which takes 'suru'
non-stop talking; chattering; speaking indiscreetly
Describes talking on and on, often without thinking or revealing too much. Can be used as an adverb, adjectival noun, or with する.
彼は秘密をべらべらしゃべってしまった。
He blabbed the secret indiscreetly.
That person is always chattering away.
na-adjective, adverb, noun, noun or participle which takes 'suru'
Describes something thin and flimsy, like paper or cloth. Less common than the talking sense.
この紙はべらべらで破れやすい。
This paper is thin and tears easily.