Approximate; rough (e.g., an approximate number or calculation).
アバウトに三十人くらい集まる予定です。
About thirty people are expected to gather (approximately).
時間はアバウトでいいから、遅れそうなら連絡して。
An approximate time is fine; if you'll be late, let me know.
アバウトな計算ではなく、正確な数字を出してください。
Don't give a rough estimate; please provide exact numbers.
Sloppy, careless, or lackadaisical; describes a person or manner of doing things that is imprecise or negligent.
彼の仕事ぶりはアバウトで、細かいミスが目立つ。
His work is sloppy, and small mistakes stand out.
アバウトな説明では分かりにくいので、具体的に書いてください。
A vague explanation is hard to follow, so please write it concretely.
彼女は細かいことにこだわらない、どちらかというとアバウトな性格だ。
She doesn't fuss over details; she's rather easygoing/sloppy in character.