IPA: /ˌɪn.kənˈkluː.sɪv/
KK: /ɪnˈkənˌkluːsɪv/
Not leading to a clear or definite conclusion; uncertain or ambiguous.
The results of the experiment were inconclusive, so we need to conduct more tests.
Inconclusive → It is formed from "in-" (meaning not) and "conclusus" (from Latin "concludere", meaning to close or conclude). The word "inconclusive" means not leading to a conclusion or not definitive.
Think of 'not' ('in-') leading to a 'conclusion' ('conclusus') — that's why inconclusive means something that doesn't lead to a clear answer.