hollow

Synonyms: alveolate arched carved out cavernous cleft concave cupped cup-shaped curved deep-set depressed dimpled excavated incurved indented infundibular notched not solid pitted striated sunken troughlike unfilled vacant vaulted void

Antonyms: convex full raised solid

Synonyms: cavernous clangorous dull echoing flat ghostly low muffled mute muted resounding reverberant ringing roaring rumbling sepulchral sounding thunderous toneless vibrant vibrating

Antonyms: high light soft

Synonyms: empty fruitless futile idle nugatory otiose pointless specious unavailing useless vain worthless

Antonyms: earnest meaningful sincere substantial

Synonyms: cynical deceitful faithless flimsy hypocritical insincere treacherous unsound weak

Antonyms: frank genuine honest real sincere truthful

Synonyms: basin bottom bowl cave cavern cavity chamber channel cleft concavity crater cup dale den depression dimple dip dish excavation groove gulf hole indentation notch pit pocket sag scoop sinkage sinkhole socket trough vacuity valley void

Antonyms: solid

Synonyms: channel chase corrugate dent dig dish ditch excavate furrow gorge groove indent notch pit rabbet remove rut scoop shovel trench

Antonyms: fill make convex raise