imperceptive

/ˌɪmpərˈsɛptɪv/
adjective
  1. Lacking the ability to notice or understand things quickly or accurately; not perceptive.
    • He was so imperceptive that he didn't realize his friend was upset.
    • An imperceptive observer might think the painting is just a mess of colors.
    • The imperceptive student missed the teacher's hints about the answer.
What does "imperceptive" mean? | whatsthatwordmean | whatsthatwordmean