Bombing his own men and planes was more than even the most phlegmatic observer could stomach, and it looked like the end for him.
Nately stared at her covertly from his over-stuffed yellow armchair, marveling at the bored, phlegmatic strength with which she accepted the mass rejection.
A bland, phlegmatic smile hung on his brown face with its heavy-bearded cheeks, and he was buffing the facets of his bald head gently with the palms of both hands.
Nately’s father — and everyone else’s father Nately had ever met — was dignified, wise and venerable; this old man was utterly repellent, and Nately plunged back into debate with him, determined to repudiate his vile logic and insinuations with an ambitious vengeance that would capture the attention of the bored, phlegmatic girl he had fallen so intensely in love with and win her admiration forever.
She sat on the sofa in a passive, phlegmatic stupor, her mouth open and all her clothing crumpled in a corner on the floor, and wondered how much longer they would sit around naked with her and make her say uncle in the elegant hotel suite to which Orr’s old girl friend, giggling uncontrollably at Yossarian’s and Dunbar’s drunken antics, guided Nately and the other members of the motley rescue party.
There are no more uses of "phlegmatic" in the book.
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She views him as phlegmatic and dull, but I think of him as steady and unflappable.
Sometimes I think it is a great mistake to have matter that can think and feel. It complains so. By the same token, though, I suppose that boulders and mountains and moons could be accused of being a little too phlegmatic.