undiscerning

/ˌʌndɪˈsɜːrnɪŋ/
adjective
  1. Lacking good judgment or the ability to notice and appreciate differences, especially in quality or value.
    • His undiscerning taste in music meant he enjoyed even the worst pop songs.
    • An undiscerning reader might not notice the flaws in the plot.
    • The undiscerning tourist bought cheap souvenirs that fell apart the next day.