'Buddhistic' originates from English, specifically formed from 'Buddhist' + the suffix '-ic' (from Latin '-icus' via Greek '-ikos'), where the suffix '-ic' meant 'pertaining to'.

'Buddhistic' developed by adding the adjectival suffix '-ic' to 'Buddhist'. 'Buddhist' itself comes from 'Buddha' (from Sanskrit 'Buddha', meaning 'the awakened one') with the agentive suffix '-ist' added in modern English usage.

Initially it meant 'pertaining to Buddha or Buddhism,' and over time it has retained that basic sense, also being used to mean 'in the style of or characteristic of Buddhism.'