'untrusted' originates from the prefix 'un-' meaning 'not' and the word 'trust', which comes from Old Norse 'traust', meaning 'confidence, protection'.

'trust' changed from the Old Norse word 'traust' and eventually became the modern English word 'trust'.

Initially, 'trust' meant 'confidence or protection', but over time it evolved into its current meaning of 'reliance on the integrity, strength, ability, surety, etc., of a person or thing'.