More tameless is an uncommon term, often used to describe something that is wild and uncontrollable. However, if you are looking for synonyms, you can use words like feral, untamed, savage, and unmanageable. These words carry the same meaning as more tameless - something that cannot be tamed or controlled easily. Other words such as ferocious, unrestrained, barbaric, and tempestuous can also be used in place of more tameless to show the intensity of wildness or lack of control. Whichever synonym you choose to use, remember to match it with the intended context and use it appropriately.