boat-shaped
boatlike
bowl-shaped
bowllike
cavelike
cavernous
concave
concaved
craterlike
cup-shaped
cupped
cymbiform
dish-shaped
dished
dishing
dishlike
funnel-breasted
funnel-chested
funnel-shaped
hollow
hollowed
incurved
incurving
incurvous
infundibular
infundibuliform
navicular
naviform
retiring
retreating
saucer-shaped
scaphoid
scyphate
sunk
sunken