Mid 19th century; earliest use found in Sydney Morgan (bap. 1783, d. 1859), novelist and socialite. From French merveilleux, use as noun of merveilleux.
Definition of merveilleux in US English:
merveilleux
nounˌməːveɪˈjəː
historical
Incroyable.
Origin
Mid 19th century; earliest use found in Sydney Morgan (bap. 1783, d. 1859), novelist and socialite. From French merveilleux, use as noun of merveilleux.