impropriety

UK
/ˌɪmprəˈpraɪəti/
US
/ˌɪmprəˈpraɪədi/

Library

Mrs. Van Stuyler looked a little aghast at the idea at first, but she too had something of the same feeling as Zaidie, and besides, there could hardly be any impropriety in accepting the invitation of one of the wealthiest and most distinguished noblemen in the British Peerage.
etiquette
Il ne pourrait guère y avoir d’inconvenance à accepter
Accepter l’invitation ne serait presque certainement pas considéré comme inconvenant.
A Honeymoon in Space
A Honeymoon in Space is a 1901 novel by George Griffith. It was originally serialized in abridged form in Pearson's Magazine in 1900 under the title Stories of Other Worlds. The scientific romance story depicts a tour of the Solar System, a type of story that was in vogue at the time.
A Honeymoon in Space