insolent, ill-mannered.
irrelevant, useless.
An impertinent individual.
Ambivalent; unconcerned; uninterested, apathetic.
Indicating or reflecting a lack of concern or care.
Having no preference.
Mediocre (usually used negatively in modern usage).
Not making a difference; without significance or importance.
Being in the state of neutral equilibrium.
A person who is indifferent or apathetic.