IPA: /ˌɪntrəˈpɜːrsənl/
KK: /ɪntrəˈpɜrsənl/
Relating to the internal thoughts and feelings of a person.
She developed her intrapersonal skills to better understand her emotions.
Intrapersonal is formed from "intra-" (meaning within) and "personalis" (from Latin "persona", meaning person). The word describes processes or interactions that occur within an individual, relating to their own thoughts and feelings.
Think of 'within' ('intra-') and 'person' ('persona') to remember that intrapersonal refers to things happening inside a person.