Definition of monstrous adjective from the Oxford Advanced American Dictionary

     

    monstrous

     adjective
    adjective
    NAmE//ˈmɑnstrəs//
     
     
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  1. 1considered to be shocking and unacceptable because it is morally wrong or unfair synonym outrageous a monstrous lie/injustice
  2. 2very large synonym gigantic a monstrous wave
  3. 3very large, ugly, and frightening synonym horrifying a monstrous figure/creature
monstrously
 
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adverb monstrously unfair a monstrously fat man
See the Oxford Advanced Learner's Dictionary entry: monstrous