pre-noun adjectival
considerable; great; important; a big deal
Used before nouns to express that something is remarkable, significant, or not trivial. Often appears in negative or rhetorical contexts (e.g., 大したことない).
He succeeded without making much effort.
I'm glad it wasn't a serious injury.
That movie was no big deal.
It's not a serious injury, so please don't worry.
Becoming president at that age—he's quite an impressive person.
With rain this light, it probably won't turn into anything serious.