IPA: /ˈbædli/
KK: /ˈbædli/
In a way that is not good or satisfactory; poorly.
She performed badly on the test and didn't pass.
Badly → The word 'badly' is formed from 'bad' (of uncertain origin, possibly from Old English 'bæddel', meaning evil or wicked) and the suffix '-ly' (meaning in a manner of). The word 'badly' means in a manner that is bad or poorly.
Think of 'bad' to remember that 'badly' means doing something in a bad or poor manner.