无忧 (wú yōu) literally means 'without worry' — 无 (wú) means 'not' or 'without,' and 忧 (yōu) means 'worry,' 'anxiety,' or 'sorrow.' Together, they form a compound adjective describing a state of complete freedom from care or distress. It conveys deep tranquility and emotional security, often implying an ideal or aspirational condition rather than everyday casual relaxation.

This term appears frequently in classical literature, philosophical texts (especially Daoist and Buddhist contexts), and modern expressions about ideal living conditions — such as '无忧无虑' (wú yōu wú lǜ, 'carefree and without anxiety'). It’s commonly used to describe people, lifestyles, environments, or states of mind, especially when emphasizing inner peace, safety, or harmony. While positive and poetic, it’s not typically used for temporary moods like 'I’m relaxed today'; instead, it suggests a sustained, profound absence of concern.