IPA: /ɪn.kəmˈpliːt.nəs/
KK: /ɪnˌkɑmplɪˈnɛs/
The state of not being finished or whole.
The incompleteness of the report made it difficult to draw conclusions.
Incompleteness → It is formed from "in-" (meaning not) and "completeness" (from Latin "completus", meaning filled or finished, plus the suffix "-ness" which indicates a state or quality). The word "incompleteness" means the state of not being filled or finished.
Think of 'not' ('in-') being added to 'completeness', which means the state of being finished. This helps you remember that incompleteness refers to the state of not being complete.