1823, "cheerful," from Latin hilaris "cheerful, lively, merry, joyful, of good cheer" (see hilarity) + -ous. Meaning "boisterously joyful" is from 1835. Related: Hilariously.
hilarious broad comedy
hijack
hijinks
hijra
hike
hiker
hilarious
hilarity
Hilary
Hilda
Hildebrand
Hildegard
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