Milo answered in a demure voice with his face lowered meekly.
The new bombardier beside him sat demurely with a bewitched grin and kept whistling ’Whee!’ and Yossarian wanted to reach out and crush his idiotic face with one hand as he flinched and flung himself away from the boulders and hillocks and lashing branches of trees that loomed up above him out in front and rushed past just underneath in a sinking, streaking blur.
There are no more uses of "demure" in the book.
Show samples from other sources
the shy, demure, innocent type
The fire in her eyes belied an otherwise demure countenance.