IPA: /dɪˈzæstrəsli/
KK: /dɪˈzæstrəsli/
In a way that causes great damage or harm; extremely unfortunate or catastrophic.
The project ended disastrously, leading to significant financial losses.
Disastrously → It is formed from "dis-" (meaning apart or away) and "astron" (from Latin *astrum*, meaning star). The word originally referred to events that were unfavorable or ill-fated, as if the stars were aligned against someone, leading to disastrous outcomes.
Think of something that is 'away from' good fortune ('dis-') and related to 'stars' ('astron') — this helps you remember that 'disastrously' means something that turns out very badly.