The best replacement for inattention is neglect.

The best alternatives to inattention are rated as following:
★★★★★  neglect
★★★  hemianopia
★★  selective attention
★  extinction
★  hyperactivity
★  sensory neglect
  hyperactivity-impulsivity

Your alternative for inattention is not listed? Suggest!
Speaking about inattention, one probably shouldn't forget about adhd.

Other search terms related to inattention and their ratings are:
★★★★★ adhd
★★★★ hyperactivity
You have in mind a companion for inattention and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of inattention in all years. Click on graph for more.
inattention
neglect
hemianopia