Definition of hollow adjective from the Oxford Advanced American Dictionary

      

    hollow

     adjective
    adjective
    NAmE//ˈhɑloʊ//
     
     
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  1. 1having a hole or empty space inside a hollow ball/center/tube The tree trunk was hollow inside. Her stomach felt hollow with fear.
  2. 2(of parts of the face) sinking deeply into the face hollow eyes/cheeks hollow-eyed from lack of sleep
  3. 3[usually before noun] (of sounds) making a low sound like that made by an empty object when it is hit a hollow groan
  4. 4[usually before noun] not sincere hollow promises/threats a hollow laugh Their appeals for an end to the violence had a hollow ring. His promise rang hollow (= did not sound sincere).
  5. 5[usually before noun] without real value to win a hollow victory
  6.  
    adverb to laugh hollowly
  7.  
    noun [uncountable] the hollowness of the victory
See the Oxford Advanced Learner's Dictionary entry: hollow