IPA: /ˈɒmɪnəsli/
KK: /ˈɑːmɪnəsli/
In a way that suggests something bad or unpleasant is going to happen.
The sky turned dark and the wind began to howl ominously before the storm.
Ominously → It is formed from "ominous" (from Latin "ominous", meaning foreboding or threatening) and the suffix "-ly" (meaning in a manner of). The word "ominously" means in a manner that suggests something bad or threatening is about to happen.
Think of something that feels 'foreboding' ('ominous') and how it happens 'in a manner' ('-ly') that makes you uneasy.