IPA: /juːˈnɛv.ənt.fəl/
KK: /juˈnɛvəntfəl/
The state of having no significant events or activities; a lack of excitement or change.
The uneventfulness of the small town made it a peaceful place to live.
Uneventfulness → It is formed from "un-" (meaning not) and "event" (from Latin "eventus", meaning outcome or occurrence) and "-fulness" (meaning the state of being full of). The word "uneventfulness" means the state of not being full of events or occurrences, indicating a lack of significant happenings.
Think of 'not' ('un-') having 'events' ('event') and being in a state of 'fullness' ('-fulness') — that's why uneventfulness means a lack of significant events.