The phrase 'more sewn up' can indicate something that is tightly controlled or managed, leaving no room for uncertainty or unpredictability. Its antonyms, therefore, would suggest a lack of control, looseness or openness. These antonyms could include 'unconstrained,' 'unpredictable,' 'unraveled,' 'disorganized,' 'uncontrolled,' and 'chaotic.' Alternatively, some antonyms could be 'open-ended,' 'flexible,' 'undecided,' 'undetermined,' or 'up in the air.' These words suggest a lack of rigidity, allowing for change and uncertainty. While the phrase 'more sewn up' can imply success or security, its antonyms suggest the possibility of creativity, growth, and risk-taking.