IPA: /ˌjuːnɪˈvɛntfəl/
KK: /junˈɛvɛntfəl/
Not having any important or interesting events; very ordinary or calm.
The trip was quite uneventful, with nothing exciting happening at all.
Uneventful → It is formed from "un-" (meaning not) and "eventful" (from Middle English *eventful*, meaning full of events). The word "uneventful" means not full of events or lacking significant occurrences.
Think of 'not' ('un-') having 'events' ('eventful') — that's why uneventful means a time without significant happenings.