IPA: /ˌɪmpəˈsɛptɪv/
KK: /ɪmˈpɜːrˌsɛp.tɪv/
Not able to notice or understand things easily; lacking awareness or insight.
His imperceptive nature made it difficult for him to understand the feelings of others.
Imperceptive → It is formed from "in-" (meaning not) and "perceptive" (from Latin "perceptivus", meaning able to perceive). The word describes someone who is not able to perceive or notice things.
Think of 'not' ('in-') being combined with 'able to perceive' — that's why imperceptive means unable to notice or perceive.