(1) “During the whole of a dull, dark and soundless day in the autumn of the year, when the clouds hung oppressively low in the heavens, I had been passing alone, on horseback, through a singularly dreary tract of country; and at length found myself, as the shades of the evening drew on, within view of the melancholy House of Usher.” Thus Edgar Allan Poe opened his story of “The Fall of the House of Usher” in 1839. In this beautifully crafted sentence he captured so much that is essential to the horror story—darkness, ominous solitude, foreboding calm, apprehension and uncertainty, and a deep feeling of melancholy that could soon turn to fear.

In this paragraph, “ominous” means（）.