IPA: /ʌnˈdʒʌstli/
KK: /ʌnˈdʒʌstli/
In a way that is not fair or right; in a manner that is not just.
The decision was made unjustly, without considering all the facts.
Unjustly → It is formed from "un-" (meaning not) and "justus" (from Latin, meaning just or fair) and the suffix "-ly" (meaning in a manner). The word "unjustly" means in a manner that is not just or fair.
Think of 'not' ('un-') being added to 'just' ('justus') to remember that 'unjustly' means acting in a way that is not fair.