[bù dà]
(不经常) not often; seldom; rarely; hardly; scarcely
He seldom goes to the cinema.
他不大看电影。
He hasn't been coming around much recently.
他最近不大来。
The child does not talk very much.
这孩子不大讲话。
something improbable
不大可能的事
not too clear
不大清楚
not quite proper
不大妥当
not very good
不大好
I am not very keen on going there.
我不大想到那里去。