HOLLOW

I. noun see: hole Date: before 12th century an unfilled space ; cavity , hole , a depressed or low part of a surface, II. adjective (~er; ~est) Etymology: Middle English holw, holh, from holh hole Date: 13th century having an indentation or inward curve ; concave , sunken , having a cavity within , lacking in real value, sincerity, or substance ; false , meaningless , reverberating like a sound made in or by beating on a large empty enclosure ; muffled, see: vain ~ly adverb ~ness noun III. verb Date: 15th century transitive verb to make ~, to form by a ~ing action, intransitive verb to become ~, IV. adverb Date: 1601 so as to have a ~ sound, completely, thoroughly