"Il s'habillait vraiment mal quand il était jeune."
Translation:He used to dress really badly when he was young.
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So two adverbs in a row always follow a structure where the former one modifies the latter one. Based on this you can't have three adverbs in a row. But if we place a conjuction between the words "slowly" and "unusually" in the first example, then the sentence reads well: He was speaking slowly and unusually.
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Two adverbs in a row with "-ly" - English Language Learners Stack Exchange
DUO, please check this, thank you.