Mindless
Part of speech: adjective
Definition: Showing a lack of forethought or sense. Having no sensible meaning or purpose. Heedless. Overly repetitive and unchallenging. Lacking a mind.
Example sentence: Misconceptions about Young Adult fiction aren't new to fans of the genre. From being dismissed as mindless fluff for 'Twilight'-obsessed tweens, to constant warnings that the genre is dying, kerfuffles between the media and readers occur with alarming regularity.
Vacuous
Part of speech: adjective
Definition: Showing a lack of thought or intelligence; vacant