IPA: /pərˈpɔːtɪdli/
KK: /pərˈpɔrˌtɪdli/
Used to indicate that something is claimed or believed to be true, but not necessarily proven or confirmed.
The new law was purportedly designed to improve public safety.
Purportedly → It is formed from "purport" (from Old French *purporter*, meaning to carry or convey) and the adverbial suffix "-edly" (indicating manner). The word "purportedly" means in a manner that is claimed or alleged, but not necessarily proven.
Think of 'purport' as carrying a claim or message, and the '-edly' shows how it is done — that's why purportedly means something is claimed to be true.