* Event: This word comes from the Old French "evenement," which itself comes from the Latin "eventus." "Eventus" means "outcome" or "result."
* -ful: This suffix, added to nouns, means "full of," "characterized by," or "having the quality of."
So, "eventful" literally means "full of events" or "characterized by many events."
Origin:
The word "eventful" entered English in the 14th century. It has been used to describe something filled with significant or memorable happenings ever since.