IPA: /ɪnˈkəmpliːt/
KK: /ɪnˈkəmˌpliːt/
Not having all the necessary parts or elements; not finished or whole.
The report was incomplete, missing several important sections.
Incomplete → It is formed from "in-" (meaning not) and "completus" (from Latin, meaning filled or finished). The word "incomplete" means not filled or not finished.
Think of 'not' ('in-') being added to 'finished' ('completus') — that's why incomplete means something that is not finished.