1
rough (estimate, summary, etc.);broad;general;sweeping;loose
大雑把に言えば、バスには３０名ほどの人達がいました。
Roughly speaking, there were about 30 people in the bus.
2
careless (e.g. work);sloppy;crude
あの人って大ざっぱな性格だからね。
He's the type who doesn't worry about details.
Other forms
大ざっぱ 【おおざっぱ】