The adjective varying describes something that changes in size, strength, number, or nature, like the varying wind speeds that make it fun to fly a kite.
Varying rhymes with ferrying or burying. You probably know the verb vary, which means "to change or introduce differences." Varying is the adjective form of vary and is used to describe things that change or include different elements. If you vary your diet, for example, that means you eat a wide variety of foods, not the same old thing every day.