unobservant

/ˌʌnəbˈzɜrvənt/
adjective
  1. Not noticing or paying attention to details; lacking awareness.
    • The unobservant driver didn't see the stop sign and ran through the intersection.
    • An unobservant student might miss important instructions on the test.
    • She is so unobservant that she didn't notice her friend had cut her hair.
What does "unobservant" mean? | whatsthatwordmean | whatsthatwordmean