'untrustworthily-guided' is a compound word formed from 'untrustworthy' and 'guided'. 'Untrustworthy' originates from the prefix 'un-' meaning 'not', and 'trustworthy', which comes from 'trust' and 'worthy'. 'Guided' comes from the Old English 'gīedan', meaning 'to lead or direct'.

'Untrustworthy' evolved from Middle English 'untrusti', and 'guided' from Old English 'gīedan'.

Initially, 'untrustworthy' meant 'not deserving of trust', and 'guided' meant 'led or directed'. The compound form retains these meanings.