Vocabulary
不大
bùdà
not very (clear, far away etc); not too; not often; infrequently
In a story
他背着一个不大不小的黑包,包上有几个白色的字。He had a black bag on his back, neither big nor small, with some white characters on it.假票 · The Fake Tickets · HSK 3
“那个房间里面也不大也不亮,放的都是旧东西。”“That room is neither big nor bright. It's full of old things.”太便宜的房子 · The Flat That Was Too Cheap · HSK 3
Grammar with 不大

Learn it in the app
Save a word while you read and it comes back as a flashcard, read aloud, when it is due.