'uncritical' originates from the prefix 'un-' meaning 'not' and the word 'critical', which comes from the Greek word 'kritikos', meaning 'able to judge'.

'kritikos' transformed into the Latin word 'criticus', and eventually became the modern English word 'critical', with 'un-' added to form 'uncritical'.

Initially, 'critical' meant 'able to judge', and 'uncritical' evolved to mean 'not able to judge or not involving judgment'.