marvellous in WordNet English dictionary

1. extraordinarily good or great ; used especially as intensifiers
   "a fantastic trip to the Orient"; "the film was fantastic!"; "a howling success"; "a marvelous collection of rare books"; "had a rattling conversation about politics"; "a tremendous achievement"
   fantastic  grand  howling  marvelous  marvellous  rattling  terrific  tremendous  wonderful  wondrous 
   
2. too improbable to admit of belief
   "a tall story"
   improbable  marvelous  marvellous  tall 
   
3. being or having the character of a miracle
   marvelous  marvellous  miraculous 
   

marvellous in English Wiktionary