IPA: //ʌnˈsɪŋkrənaɪzd//
KK: /ʌnˈsɪŋkrəˌnaɪzd/
Not occurring at the same time or not coordinated with something else.
The two videos were unsynchronized, causing confusion during the presentation.
Unsynchronized → It is formed from "un-" (meaning not) and "synchronize" (from Greek "synchronos", meaning occurring at the same time). The word "unsynchronized" means not occurring at the same time or out of sync.
Think of 'not' ('un-') being added to 'occurring at the same time' ('synchronize') — that's why unsynchronized means things that are not in sync.