When it comes to pondering over something deeply and at length, "ruminative thoughts" is a phrase that comes to mind. But there are other synonyms that can be used to describe this state of mind. Contemplative thoughts, musing, reflective thoughts, deep pondering are some such words. While ruminative thoughts may have a negative connotation of overthinking, the synonyms convey the positive aspect of thoughtfulness. People use words interchangeably to express their introspection and critical thinking. Whether you call it ruminative thoughts or contemplative musings, what matters is that thinking deeply and reflecting on one's ideas can be a valuable tool for personal growth and problem- solving.