Inconclusive is a word used to describe a result that is uncertain or not decisive. Antonyms for inconclusive include conclusive, definite, and decisive. Conclusive means something that is final, convincing, or settling an issue. A conclusion is arrived at through reliable evidence and reasoning. Definite implies that something is clear, precise, and specific. Decisive means an action or outcome that settles a question or dispute convincingly. Other antonyms of inconclusive include straightforward, clear-cut, unmistakable, and unambiguous. These words are often used to describe decisions, results, or evidence that is beyond doubt and leaves no room for speculation or uncertainty.