The characters combine logically: `胆 (dǎn)` + `小 (xiǎo)` creates the adjective `胆小 (dǎnxiǎo)`, meaning “timid.” Adding the suffix `鬼 (guǐ)` turns the description into a noun, a label for “a timid person” — a 胆小鬼.
In Chinese culture, bravery and courage (`勇气, yǒngqì`) are highly valued traits, historically associated with heroes, warriors, and righteous individuals. To be called a 胆小鬼 can be a direct challenge to one's character, especially for men, as it implies a lack of integrity and resolve. A key difference from the English “coward” lies in the term's physiological metaphor. The connection to the gallbladder (胆) is a uniquely Chinese cultural concept. While an English speaker might say someone “has no guts,” the Chinese expression is more specific: someone “has a small gallbladder” (`胆子小, dǎnzi xiǎo`). Compared to the American/Western “scaredy-cat,” 胆小鬼 shares a similar playful, childish connotation. However, 胆小鬼 can “scale up” in severity much more than “scaredy-cat.” While you would rarely hear an adult seriously call another adult a “scaredy-cat” in an argument, calling someone a 胆小鬼 can be a genuine and potent insult, depending on the tone and context.
The connotation of 胆小鬼 is highly dependent on the context and the relationship between the speakers.