The New York Stock Exchange started out as a coffee house.
unproved, unproven
(adjective) not proved; āunproved allegationsā; āunproved assumptionsā
Source: WordNet® 3.1
unproved (comparative more unproved, superlative most unproved)
(British) Not proved.
Source: Wiktionary
5 February 2025
(noun) activity involved in maintaining something in good working order; āhe wrote the manual on car careā
The New York Stock Exchange started out as a coffee house.