'uncool' originates from the prefix 'un-' meaning 'not' and the word 'cool', which in this context means 'fashionable or calm'.

'uncool' was formed by adding the prefix 'un-' to 'cool', a term that gained popularity in the 20th century to describe something fashionable or socially acceptable.

Initially, 'cool' meant 'calm or composed', but over time it evolved to include 'fashionable', and 'uncool' came to mean the opposite of both.