stiff /stif/ adj. 1.硬的,僵直的:a stiff collar 硬领;be stiff with cold 冻僵;stand straight and stiff直挺挺地站着 2.拘谨的,生硬的:keep a stiff face板着脸;be stiff in manner 态度生硬 3.艰难的,费劲的:a stiff task 费劲的工作;a stiff slope 陡坡,难登的坡 The book is stiff reading.  这本书不易阅读。

stiffen vi. & vt. (使)变硬,(使)硬起来

stiffness n. 坚硬,硬度