penumbra

concealment darkening decline diminution dimming extinction obliteration occultation shading shroud veil

extinguishment obscuration

increase

shadow

adumbration blackness coolness cover darkness dusk gloominess obscurity screen semidarkness shadiness shadows umbra umbrage

obscuration

light lightness

brightness gap

dark gloom obscurity shade

adumbration cover dimness dusk protection shelter umbra umbrage

obscuration

brightness light

information