IPA: /ʌnˈɡruːpt/
KK: /ʌnˈɡruːpt/
Not arranged or classified into groups or categories.
The data was left ungrouped for further analysis.
Ungrouped → It is formed from "un-" (meaning not) and "group" (from Old French *groupe*, meaning a collection or assembly). The suffix "-ed" indicates a past participle form. The word "ungrouped" means not arranged in a group or collection.
Think of 'not' ('un-') being applied to a 'collection' ('group') — that's why ungrouped means something that is not arranged in a group.