Definition of "hilarious"

Rounding up the animals in the misty paddocks, with the blackbirds singing as the morning whitened, he felt hilarious, light-headed. He'd clap the cows on their rumps and shout "Come along, there! Come along there, me Irish darlint."

1944, Douglas Stewart, A Girl with Red Hair, and Other Stories, page 60

Cold Doctor Pell here refused a very considerable fee. He could on occasion behave handsomely; but I can't learn that blustering, hilarious Doctor Rogerson ever refused his.

1863, Sheridan Le Fanu, The House by the Churchyard