IPA: /ˌɪnəˈspɪʃəsli/
KK: /ɪnəˈspɪʃəsli/
In a way that suggests something bad or unlucky will happen.
The event started inauspiciously, with heavy rain and thunder.
Inauspiciously → It is formed from "in-" (meaning not) and "auspicium" (from Latin, meaning omen or sign) and the suffix "-ly" (meaning in a manner). The word describes something that is done in a manner that is not favorable or does not bode well.
Think of 'not' ('in-') having a 'good omen' ('auspicium') — that's why inauspiciously means in a way that is not favorable.