IPA: /ʌnˈswɛpt/
KK: /ʌnˈswɛpt/
Not cleaned or cleared of dirt or debris.
The unswept floor was covered in dust and crumbs.
Unswept → It is formed from "un-" (meaning not) and "swept" (the past participle of "sweep", which comes from Old English "swipan", meaning to move quickly or to sweep). The word "unswept" means not having been swept or cleaned.
Think of 'not' ('un-') having been 'swept' — so 'unswept' means something that hasn't been cleaned.