IPA: //ˌpleɪdʒəˈrɪstɪk//
KK: /ˌpleɪdʒəˈrɪstɪk/
Relating to the act of taking someone else's work or ideas and presenting them as your own without permission.
The teacher warned the students about the plagiaristic nature of copying from the internet.
Plagiaristic → It is formed from "plagiarize" (from Latin "plagiare", meaning to seize or take) and the suffix "-istic" (meaning pertaining to). The word "plagiaristic" refers to something that pertains to the act of taking someone else's work or ideas without permission.
Think of the act of 'taking' ('plagiare') someone else's work and how 'istic' relates to that action — that's why plagiaristic means related to taking someone else's ideas.