Absent-mindedly

I went past my stop absent-mindedly.

He often leaves his umbrella behind absent-mindedly.

Marjorie saw Leonard before he saw her. He was walking with three men—joking, laughing absent-mindedly, while his eyes searched for a face in the crowd. She waited a moment, hidden, suffocated with anticipation, her heart turning over and over, until he said a nonchalant good-bye to his companions, who were pounced upon by eager relatives. Then she crept up behind and put both her hands about his wrist.

Professor Archimedes Q. Porter, his hands clasped beneath the tails of his long coat, paces back and forth under the ever-watchful eye of his faithful secretary, Mr. Samuel T. Philander. Twice within the past few minutes he has started absent-mindedly across the tracks in the direction of a near-by swamp, only to be rescued and dragged back by the tireless Mr. Philander.

On the same highway, I once absent-mindedly cut in front of this enormous jacked-up pickup truck.