IPA: //ʌnˈtɪld//
KK: /ʌnˈtɪld/
Describing land that has not been prepared for planting or cultivation.
The farmer decided to leave a section of untilled land to restore its natural habitat.
Untilled → It is formed from "un-" (meaning not) and "tilled" (from Old English "tilian", meaning to prepare land for crops). The word "untilled" means land that has not been prepared or cultivated for farming.
Think of land that is 'not' ('un-') 'prepared for crops' ('tilled') — that's what untilled means.