Synonyms for hollow

modified

1. Empty

   vacant, unfilled, void, vain; see empty 1.

2. Concave

   rounded inward, curving inward, bellshaped, curved, carved out, sunken, depressed, arched, vaulted, cup-shaped, excavated, infundibular, hollowed out, indented, incurved, cupped, cyathiform, incurving, incurvate, troughlike; see also bent, round 3.

   Antonyms convex, raised*, elevated.

3. Sounding as though from a cave

   cavernous, echoing, deep, resonant, ghostly, deep-toned, blooming, roaring, rumbling, reverberating, muffled, nonresonant, plangent, dull, resounding, vibrant, muffled, sepulchral, vibrating, low, booming, ringing, clangorous, deep, mute, deep-mouthed, deep-toned, muted, thunderous; see also loud 1.

   Antonyms dead*, mute, silent.

4. False

   flimsy, artificial, unsound; see false 2.

5. *Hungry

   unsatisfied, ravenous, starved; see hungry. See syn. study at vain.

beat all hollow*

noun

1. A cavity

   depression, dip, pit; see hole 2.

2. *A valley

   dale, bowl, basin; see valley. See syn. study at hole.