'unemotionality' originates from the prefix 'un-' meaning 'not' and the word 'emotional,' which comes from the Latin 'emovere,' where 'e-' meant 'out' and 'movere' meant 'to move.'

'emovere' transformed into the French word 'émouvoir,' and eventually became the modern English word 'emotional' through Middle English.

Initially, it meant 'not moved by emotions,' and this meaning has largely remained the same in modern usage.