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to be careless; to be inattentive; to be absentminded; to be slow
long and disheveled (e.g. hair) (dishevelled)
ぼやぼやしてると遅刻するよ。
If you dawdle, you'll be late.
ぼやぼやしないでさっさとやれ。
Don't dawdle, do it quickly.
ぼやぼやしていて電車を逃した。
I was dazed and missed the train.