"heedless, careless, negligent," 1650s, from in- (1) "not, opposite of" + attentive. Related: Inattentively; inattentiveness.
inattentive students
an inattentive babysitter
inaptitude
inarticulate
inartistic
inasmuch
inattention
inattentive
inaudibility
inaudible
inaugural
inaugurate
inauguration