hə̇ˈla(a)rēəs, -ler-, -lār- also (ˈ)hī12 l- adjective
Etymology: modification (influenced by English -ious ) of Latin hilarus, hilaris, from Greek hilaros — more at silly
: marked by hilarity : affording or given to hilarity : ludicrous , merry , mirthful
serious plays … alternated with hilarious broad comedy — W.P.Eaton
a joyous, lighthearted, and hilarious mode of life — C.A. and Mary Beard