different between unkilled vs untilled

English

un- +? killed

unkilled (not comparable)

unkill +? -ed

unkilled

un- +? tilled

untilled (not comparable)

Of land, having not been tilled.
Spring was upon us and the ground remained untilled.
- 1900, L. Frank Baum, The Wonderful Wizard of Oz
  The Emerald City was soon left far behind. As they advanced the ground became rougher and hillier, for there were no farms nor houses in this country of the West, and the ground was untilled.

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