Not held back, not tied down, not limited by rules, by other people, or by circumstances. A trammel was originally a kind of net or hobble — something you put on an animal so it cannot run freely — so 'untrammelled' pictures something with nothing tied to its legs. It is a formal, rather literary word. You will meet it in writing far more than in speech: 'untrammelled freedom', 'untrammelled power', 'untrammelled by tradition', 'untrammelled joy'. Notice the two shapes: it can sit in front of a noun ('her untrammelled imagination'), or it can come after a verb with 'by' ('untrammelled by the rules of grammar'). The feeling behind it can go either way. When people write about art, imagination, or a child playing, it sounds wonderful — freedom with nothing spoiling it. When people write about a government or a rich company, 'untrammelled power' is usually a warning: nobody is watching them, and that is the problem. The word itself does not choose; what it is attached to chooses. British writers spell it with two l's; Americans usually write 'untrammeled'. Both are correct — just be consistent inside one piece of writing.

不受拘束的、無拘無束的;(權力等)不受約束、不受限制的