convex vs hollow

convex

adj
  • Curved or bowed outward like the outside of a bowl, circle, or sphere. 

  • arranged such that for any two points in the set, a straight line between the two points is contained within the set. 

  • having no internal angles greater than 180 degrees. 

  • having an epigraph that is a convex set. 

noun
  • A playing card made convex for use in cheating. 

  • A small convex mirror used to cheat by observing other players' cards. 

  • Any convex body or surface. 

hollow

adj
  • Pertaining to hollow body position 

  • Concave; gaunt; sunken. 

  • Insincere, devoid of validity; specious. 

  • Distant, eerie; echoing, reverberating, as if in a hollow space; dull, muffled; often low-pitched. 

  • Without substance; having no real or significant worth; meaningless. 

  • Having an empty space or cavity inside. 

noun
  • A sunken area or unfilled space in something solid; a cavity, natural or artificial. 

  • A sunken area. 

  • A small valley between mountains. 

  • A feeling of emptiness. 

verb
  • To call or urge by shouting; to hollo. 

  • to make a hole in something; to excavate 

adv
  • Completely, as part of the phrase beat hollow or beat all hollow. 

How often have the words convex and hollow occurred in a corpus of books? (source: Google Ngram Viewer )