Meanings of often inattentive in English

I think, sir, that you must have been often inattentive.

He was often inattentive; and his master scolded him.

Maurice Cumming was often inattentive to her, plainly showing that he was worried by her importunities and ill at ease in her company.

Obstructive sleep apnea is a common disorder in which the airway repetitively collapses during sleep; patients with sleep apnea are often inattentive and sleepy.

She never could learn or understand anything before she was taught; and sometimes not even then, for she was often inattentive, and occasionally stupid.