ETYM Cf. French inattentif.
1. Not paying attention; SYN. unobservant, unvigilant, unwatchful.
2. Not showing due care or attention; SYN. neglectful.
3. Showing a lack of attention.
4. Uninterested; bored.
5. Unwilling to hear; SYN. unheeding, unlistening, deaf to.