Webster's English Dictionary

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hilarious

hi.lar.i.ous \hil-'ar-e--*s, hi--'lar-, hil-'er-, hi--'ler-\ aj [irreg. fr. 
   L hilarus, hilaris cheerful, fr. Gk hilaros] : marked by or affording 
   hilarity  - hi.lar.i.ous.ly av