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Unattentive (adjective)
Not attentive.
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Inattentive (adjective)
Of or pertaining to lack of attention; not paying attention; careless.
“He was inattentive in class and did not do well in his exams.”
Wiktionary
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Inattentive (adjective)
not paying attention to something
“a particularly dull and inattentive pupil”
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Inattentive (adjective)
failing to attend to the comfort or wishes of others
“I was disappointed by the food and the inattentive service”
Oxford Dictionary