undulating

Moving up and down like waves; wavy.

From Belgrade the train is hauled by a 2-10-0, and makes good time through undulating country, with vineyards and herds of woolly pigs, over single line to Nish, where the Sofia and Istanbul portion, including through coaches (until recently) from Prague to Sofia, the capital of Bulgaria, is detached.

The Borinage coalfield around Mons is another attractive area for the railway enthusiast; it is rather like South Lancashire, with its gently undulating landscape studded with slag heaps and pithead gear and criss-crossed by railway lines and tramways.

Forming a series of regular curves.

Leaving behind us the town at the bottom of its deep bay, we set out to explore a bluff-headed parallelogramical promontory, bounded by Thurso Bay on the one hand, and Murkle Bay on the other, and which presents to the open sea, in the space that stretches between, an undulating line of iron-bound coast, exposed to the roll of the northern ocean.

undulation

In good poetry every word and phrase, as Professor McKail says, reverberates like the sound of a lyre, and leaves after it numberless undulatings. The verse exhales sweet sound, and light-like thought, as perfumes do; but we cannot explain just why.