unintentional

an inadvertent insult.

not attentive; heedless.

of, pertaining to, or characterized by lack of attention.

adjective

advertent , attentive , deliberate , intentional , planned

adjective

careless , chance , feckless , heedless , irreflective , negligent , not on purpose , reckless , thoughtless , uncaring , unconcerned , undesigned , undevised , unheeding , unintended , unintentional , unmindful , unplanned , unpremeditated , unthinking , unthought , unwitting , unmeant , casual , contingent , fluky , fortuitous , odd , accidental , carless