They were less than 'enthusiastic'. = They were far from 'enthusiastic'.
They were 'enthusiastic' supporters of the president.
I'm not wildly 'enthusiastic' about your latest idea.
(..) Oh, speaking of builders, all the best brothels burned down. The Master of Coin is willing to fund reconstruction. Uh... the Archmaester is less than enthusiastic about the salutary effects of brothels. Well, I imagine he isn't using them properly. I think we can all agree that ships (..)2019 TvShow: Game of Thrones Title: The Iron Throne Season: 8 Episode 6