inattentive
     adj 1: showing a lack of attention; "inattentive students" [ant: {attentive}]
     2: inattentive because of lack of interest
     3: not showing due care or attention; "inattentive students";
        "an inattentive babysitter"; "neglectful parents" [syn: {neglectful}]
     4: unwilling to hear [syn: {unheeding}, {unlistening(a)}, {deaf
        to(p)}]
     5: not paying attention [syn: {unobservant}, {unvigilant}, {unwatchful}]
Source: WordNet® 2.0