[hi.lar.i.ous] adj [irreg. fr. L hilarus, hilaris cheerful, fr. Gk hilaros] (ca. 1840): marked by or affording hilarity -- hi.lar.i.ous.ly adv -- hi.lar.i.ous.ness n
HILARIOUS
Meaning of HILARIOUS in English
Merriam-Webster English vocab. Английский словарь Merriam Webster. 2012