'unsociable' originates from the prefix 'un-' meaning 'not' and the word 'sociable' from Latin 'sociabilis', meaning 'friendly'.

'sociabilis' transformed into the Old French word 'sociable', and eventually became the modern English word 'sociable', with 'un-' added to form 'unsociable'.

Initially, it meant 'not friendly or not seeking company', and this meaning has largely remained the same in modern usage.