shadowless
Adjective: - Lacking a shadow: "shadowless" describes something that does not cast a shadow or is not accompanied by a shadow. This can refer to objects in bright, diffuse light (e.g., under an overcast sky) or to metaphorical absence of obscurity or darkness.
- (The object did not cast any shadow because the light was evenly spread.)
- (The sun’s high angle minimized shadows.)
- (The lack of a shadow implies artificial illumination.)
"Shadowless as a ghost": a poetic or literary phrase meaning something so ethereal or insubstantial that it casts no shadow.
- The figure moved through the forest, shadowless as a ghost. (The figure seemed unreal or ghostly.)
"Shadowless light": in photography or art, light that produces no discernible shadows, often used for a flat, even illumination.
- The photographer used a ring light to create a shadowless effect for product shots. (The lighting eliminated shadows on the subject.)
Shadow (n): a dark area or shape produced by a body coming between rays of light and a surface.
- The tree cast a long shadow in the afternoon sun. (A dark area on the ground.)
Shadowy (adj): full of shadows; indistinct or mysterious.
- The shadowy figure disappeared into the alley. (The figure was hard to see because of darkness.)
Shadowless is a direct derivative formed by adding the suffix "-less" (meaning "without") to "shadow."
Unshadowed: not darkened or obscured by a shadow.
- The unshadowed meadow was bathed in sunlight. (No shadows were present.)
Shadow-free: entirely without shadows.
- The shadow-free zone was ideal for the experiment. (No shadows interfered.)
Without a shadow of a doubt: completely certain (note: this idiom uses "shadow" metaphorically, not "shadowless").
- He was without a shadow of a doubt the best candidate. (Absolutely certain.)
Afraid of one's own shadow: extremely timid (again, a metaphorical use of "shadow").
- She’s so shy she’s afraid of her own shadow. (Very fearful.)
Note: There are no common phrasal verbs or idioms that directly use "shadowless." The word is primarily a descriptive adjective.