The word 没劲 (méijìn) is a compound formed by combining the negation 没 (méi), meaning "without" or "to lack", with the noun 劲 (jìn), which denotes "strength", "energy", or "vigor". Literally, it translates to "without strength/energy". Through common usage, this literal meaning has been extended metaphorically to describe situations, activities, or people that are "uninteresting", "boring", or "not worthwhile", effectively capturing the feeling of something that fails to stimulate one's energy or enthusiasm.