distractable

/dɪˈstræktəbəl/
adjective
  1. Easily distracted; having difficulty paying attention or staying focused on one thing.
    • She knew she was distractable, so she turned off her phone while studying.
    • In a noisy classroom, even the best students can become distractable.
    • My younger brother is very distractable and can't finish his homework without constant reminders.