'uncharred' originates from English: it is formed from the negative prefix 'un-' (origin: Old English 'un-' meaning 'not') plus the past participle 'charred' of the verb 'char' (origin: Middle English 'charren'/'char'), where 'char' meant 'to burn slightly; to blacken by burning.'

'char' changed from Middle English 'charren' (or similar Middle English forms) into modern English 'char'; the productive negative prefix 'un-' (Old English 'un-') combined with the past participle form to create 'uncharred.'

Initially associated with the action 'to make black by burning' and denoted material 'not blackened by burning'; over time the sense has remained essentially the same, describing something that has not been burned or scorched.