The word "犹豫不决" is a classic example of a Chinese idiom (chengyu) formed through parallelism and reinforcement, where the first two characters "犹豫" (yóuyù), meaning "hesitant" or "indecisive," are directly paired with the latter two "不决" (bùjué), meaning "unable to decide." This structure creates a compound expression where both halves semantically reinforce the same core concept of hesitation and inability to reach a conclusion. Its formation is often traced to an ancient legend about two indecisive beasts, a "犹" and an "豫," metaphorically solidifying the term's association with wavering doubt.