'non-aggressive' originates from the prefix 'non-' meaning 'not' and the word 'aggressive', which comes from Latin 'aggressivus', meaning 'attack'.

'aggressivus' transformed into the French word 'agressif', and eventually became the modern English word 'aggressive'. The prefix 'non-' was added to form 'non-aggressive'.

Initially, 'aggressive' meant 'attack', but over time, 'non-aggressive' evolved to mean 'not inclined to attack or confront'.