"Out of the box" is an idiomatic expression that refers to thinking creatively or unconventionally. It describes a mindset that encourages innovative approaches and solutions to problems. One synonym for this phrase is "unconventional," which suggests a willingness to take risks and break free from established norms. Another synonym is "original," which implies a unique perspective or idea that hasn't been tried before. "Inventive" is another synonym that denotes resourcefulness and imagination. "Radical" suggests a complete departure from traditional methods, while "innovative" connotes a fresh approach to problem-solving. Overall, these synonyms capture the spirit of "out of the box" thinking and highlight the importance of creativity and innovation in today's world.