om·i·nous 
/ˈɑ:mənəs/ adjective
/ˈɑ:mənəs/ adjective [more ominous; most ominous] : suggesting that something bad is going to happen in the future
▪ ominous clouds ▪ an ominous threat of war ▪ He spoke in ominous tones.
▪ ominous clouds ▪ an ominous threat of war ▪ He spoke in ominous tones.
— om·i·nous·ly adverb
▪ A threat of war loomed ominously. ▪ The sky was ominously dark.
▪ A threat of war loomed ominously. ▪ The sky was ominously dark.
