smashing
n.n. excellent, wonderful, or very impressive. You use this when you are very happy with something or someone.
n. exceptionally good, impressive, or wonderful. Primarily used in British English; informal in register.
We had a smashing time at the party.
The team did a smashing job on the presentation and received a standing ovation from the board.
The critic described the performance as a smashing success, noting that the lead actor's range was unlike anything seen on the local stage in decades.
From smash + -ing. As a synonym for wonderful, the term first appeared in the United States in the early twentieth century, and possibly derives from the sense of smash used in smash hit and similar terms. Popular folk etymology connects the term to the broadly homophonous Irish is maith sin or Scottish Gaelic 's math sin ("that is good"), but this has been described as "improbable", and does not appear in the etymological dictionaries.
Typically used as a predicative adjective after a linking verb or as an attributive adjective before a noun.