Wiktionary
a. Not darkened.
Usage examples of "undarkened".
Now everything was overgrown with brush, and the stream ran clear and clean, undarkened by placer tailings.
Injustice, oppression and warfare have undarkened our portals for two hundred Star King years.
It is so that men make little kingdoms for themselves, and an international power undarkened by diplomacy, undirected by parliaments.
On the other side the walls were undarkened, and grass and plants were growing.
In the light, fresh American air, unthickened and undarkened by customs and institutions established, these things, as the phrase is, told.
The transpax had undarkened and there was an expanding orange halo where the asteroid had been, hazy like a streetlight seen through fog, still expanding and fading back to red as he watched.