The Chinese word "不切实际" (bù qiè shíjì) is a four-character idiom formed through a logical syntactic combination: the negative adverb "不" (bù, meaning "not") modifies the verb phrase "切实际," where "切" (qiè) means "to cut" or figuratively "to correspond to/meet," and "实际" (shíjì) means "reality" or "practice." Thus, the literal construction "not correspond to reality" yields the metaphorical meaning of "unrealistic" or "impractical," describing ideas or plans that are detached from real-world conditions.