"Oh, my life is very simple," said Dorothea, her lips curling with an exquisite smile, which irradiated her melancholy.
But he had deliberately incurred the hindrance, having made up his mind that it was now time for him to adorn his life with the graces of female companionship, to irradiate the gloom which fatigue was apt to hang over the intervals of studious labor with the play of female fancy, and to secure in this, his culminating age, the solace of female tendance for his declining years.
There are no more uses of "irradiate" in the book.
Show samples from other sources
He was irradiated by the dawn of a great amazement.
H.G. Wells -- The Invisible Man
For, d’ye see, rainbows do not visit the clear air; they only irradiate vapour.