麻木 (má mù) literally combines 麻 (má), meaning 'tingling' or 'numbness' — often associated with loss of physical sensation — and 木 (mù), meaning 'wood', evoking stiffness, lifelessness, or lack of responsiveness. Together, they describe a state where sensation or feeling is dulled, whether physically (e.g., from cold, pressure, or nerve damage) or emotionally (e.g., after prolonged stress, trauma, or emotional exhaustion).

The word is commonly used in both medical and psychological contexts. As an adjective, it typically follows the subject and precedes verbs like 感觉 (gǎnjué, 'to feel') or appears after 是 (shì) or 很 (hěn). It carries a slightly negative connotation, suggesting unhealthy detachment or impaired responsiveness rather than calm neutrality. While originally rooted in bodily experience, its figurative use for emotional blunting is now equally frequent in everyday speech and writing.