The term 'more clinched' implies a situation where something is certain, finalized or secured in a greater measure. The antonyms for this phrase would be words that express uncertainty or lack of finality. Such words might include terms like doubtful, questionable or ambiguous, which suggest a lack of clarity, confidence or conviction. Additionally, terms like open ended, tentative or exploratory might indicate a sense of incomplete or ongoing quest for answers, rather than the definitive resolution implied by the phrase 'more clinched'. In short, the antonyms for 'more clinched' would be words that suggest a lack of finality, closure or conviction.