The adverbal adjective solide is polysemous and occurs in a wide range of syntactic uses in Quebec and Acadia. This distribution makes it a pan-Canadian diatopism. This article aims to describe the recent adverbial use of solide in Canadian French (first attested in 1974, but frequent since 1990) from a micro-diachronic perspective. It is based on oral data drawn from existing corpora of Quebec and Acadian French. We argue that the origin of the adverbial use of solide differs in these two varieties. In the province of Quebec, it emerged from ‘metanalytic’ contexts (Corminboeuf 2023), paving the way for a change in grammatical category. In Acadia, it is attributed to contact with North American English, where the ‘monocategorial’ type A (Hummel & Kröll, 2015:41) is frequent. This influence has been mentioned before (Neumann- Holzschuh & Mitko, 2019:265) but has never been formally demonstrated.