'calm-centered' originates from the English words 'calm' and 'centered', where 'calm' means 'free from agitation' and 'centered' means 'focused or balanced'.

'calm' and 'centered' were combined in modern English to form the compound adjective 'calm-centered'.

Initially, 'calm' meant 'free from disturbance', and 'centered' meant 'having a center'. Over time, they combined to describe a state of being both calm and focused.