'ungathered' originates from English by combining the negative prefix 'un-' (from Old English 'un-') with the past participle 'gathered' of 'gather' (from Old English/Middle English roots meaning 'to bring together, collect').

'gather' developed from Old English (e.g. 'gaderian' / Middle English 'gaderen') meaning 'to collect'; the form 'gathered' is its past participle, and 'ungathered' arose in later English by adding the prefix 'un-' to indicate the opposite state (not gathered).

Initially it meant 'not collected together' or 'not brought together'; over time this literal sense has largely remained, though it has also been used descriptively for untidy or loose appearance (e.g. ungathered hair).