Both Uses of

mitigate

in

Mrs. Dalloway

Oddly enough, she was one of the most thoroughgoing sceptics he had ever met, and possibly (this was a theory he used to make up to account for her, so transparent in some ways, so inscrutable in others), possibly she said to herself, As we are a doomed race, chained to a sinking ship (her favourite reading as a girl was Huxley and Tyndall, and they were fond of these nautical metaphors), as the whole thing is a bad joke, let us, at any rate, do our part; mitigate the sufferings of our fellow-prisoners (Huxley again); decorate the dungeon with flowers and air-cushions; be as decent as we possibly can.†

"The address?" murmured Hugh Whitbread; and there was at once a ripple in the grey tide of service which washed round Lady Bruton day in, day out, collecting, intercepting, enveloping her in a fine tissue which broke concussions, mitigated interruptions, and spread round the house in Brook Street a fine net where things lodged and were picked out accurately, instantly, by grey-haired Perkins, who had been with Lady Bruton these thirty years and now wrote down the address; handed it to Mr. Whitbread, who took out his pocket-book, raised his eyebrows, and slipping it in among documents of the highest importance, said that he would get Evelyn to ask him to lunch.†
*

mitigated = made less harmful or unpleasant

Definition:

make less harmful or unpleasant