While we found no official definition found for "ill-hearted", we think that it means someone who is not considerate.
"ill-" is a prefix which means "in a way that is bad or not suitable". Looking for words starting with "ill"? Here's a list of words you may be looking for shared by Wordhippo.com.
Prefixes and suffixes are a really common part of the English language – you’ll be using them a lot! So learning how to use them correctly will help you boost your language skills enormously.
Here are some tips on how to use prefixes and suffixes from Eurocentres.com.