say it: HAH-loh
hollow is an adjective, noun and verb meaning "not solid; having a space or gap or cavity". It carries 9 recorded senses.
as if echoing in a hollow space
“the hollow sound of footsteps in the empty ballroom”
devoid of significance or force
“empty promises”
“a hollow victory”
“vacuous comments”
a depression hollowed out of solid matter
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for hollow come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.