ominously

ad.有预兆的，不祥的

oleander, olfaction, olfactory, oligarch, oligarchy, olive, olive oil, olive-branch, Olympiad, Olympian, Olympic, Olympic Games, Olympics, OM, ombudsman, omega, omelet, omelette (also omelet), omen, ominous, omission, omit, omni-, omnibus, omnipotence, omnipotent, omnipresent, omniscience, omniscient, omnivorous, on, on (the/an) average, on a large scale, on a level with, on a river, on a small scale, on a weekly (daily basis), on account of, on an average, on an even keel,