Synonyms for Episodic (same or very similar meaning)
WordNet sense 1 (separated into parts or pieces):
dividedWordNet sense 2 (occurring or appearing at usually irregular intervals):
occasionalWordNet sense 3 (not capable of being foretold):
unpredictableWordNet sense 4 (not permanent; not lasting):
impermanent, temporaryFrom the ODE community, based on WordNetadd/edit