Is there a phrase or verb that describes that?
Do you mean "not attentive to his surroundings" in the sense that he is completely absorbed in his work, or do you mean that he works without proper care and attention to what he is doing?
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Do you mean "not attentive to his surroundings" in the sense that he is completely absorbed in his work, or do you mean that he works without proper care and attention to what he is doing?