IPA: /ʌnˈkrɒnɪkəld/
KK: /ʌnˈkrɒnɪkəld/
Not recorded or documented in a formal way.
Many events in history remain unchronicled, leaving gaps in our understanding of the past.
Unchronicled → It is formed from "un-" (meaning not) and "chronicled" (from Latin "chronicus", meaning relating to time, and Greek "khronikos", meaning of time). The word "unchronicled" means not recorded in a chronological account or history.
Think of 'not' ('un-') being added to 'recorded in time' ('chronicled') — that's why unchronicled means something that hasn't been recorded in history.