Inconclusive means that something is uncertain, vague or not capable of providing a definite answer. Its antonyms or opposite words are those that convey certainty, finality or the ability to put an end to a discussion or argument. Some of the Antonyms for inconclusive include decisive, conclusive, definitive, authoritative, final, positive, resolute, determined and emphatic. These antonyms connote confidence, clarity and resolution, and are often used to indicate a conclusive answer or outcome. While inconclusive suggests indecision or ambiguity, antonyms such as decisive, conclusive or definitive provide a clear and precise perspective.