retreating (?.)

• boat-shaped
• boatlike
• bowl-shaped
• bowllike
• cavelike
• cavernous
• concave
• concaved
• craterlike
• cup-shaped
• cupped
• cymbiform
• declining
• diminishing
• dish-shaped
• dished
• dishing
• dishlike
• dwindling
• dying
• ebbing
• fading
• funnel-breasted
• funnel-chested
• funnel-shaped
• hollow
• hollowed
• incurved
• incurving
• incurvous
• infundibular
• infundibuliform
• navicular
• naviform
• receding
• retiring
• saucer-shaped
• scaphoid
• scyphate
• shrinking
• sinking
• spoonlike
• sunk
• sunken
• waning