Inattentiveness and negligence are synonymous. Negligent chanting sows the seeds of anarthas, which soon fructify.
Inattentiveness is of three kinds:
 audasinya: or 'apathetic devotional service', meaning a lack of fixed resolve in sadhana.
 jadya: 'laziness' or even 'inertia'.
 viksepa: which means 'distraction' or 'misplacing one's attention in engagements not directly connected with sadhana bhakti