impercipient

/ˌɪmpərˈsɪpiənt/
adjective
  1. Lacking perception, awareness, or understanding; not able to notice or comprehend things.
    • The impercipient student missed the teacher's hints about the upcoming test.
    • The impercipient driver failed to see the warning signs on the road.
    • He was so impercipient to her feelings that he didn't realize she was upset.
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