Partly ruinous it seemed, but already before the night was passed the sound of hurried labour could be heard: beat of hammers, clink of trowels, and the creak of wheels.
Then among the greater casts there fell another hail, less ruinous but more horrible.
The Enemy has found it, and now his power waxes; he sees our very thoughts, and all we do is ruinous.
Far above a great cloud streamed slowly westward from the Black Land, devouring light, borne upon a wind of war; but below the air was still and breathless, as if all the Vale of Anduin waited for the onset of a ruinous storm.
Between them and the smoking mountain, and about it north and south, all seemed ruinous and dead, a desert burned and choked.
But deep in his heart there was something that restrained him: he could not strike this thing lying in the dust, forlorn, ruinous, utterly wretched.
The Towers of the Teeth swayed, tottered, and fell down; the mighty rampart crumbled; the Black Gate was hurled in ruin; and from far away, now dim, now growing, now mounting to the clouds, there came a drumming rumble, a roar, a long echoing roll of ruinous noise.
There are no more uses of "ruinous" in the book.
Show samples from other sources
It was a ruinous war.
He gave notes, took up ruinous obligations, dealt with usurers and all the race of lenders.