IPA: //ʌnˈdʒʌstɪfaɪəbl//
KK: /ʌnˈdʒʌstəˌfaɪəbl/
Something that cannot be justified or excused; it is unfair or wrong.
The decision to cut funding for education was seen as unjustifiable by many parents.
Unjustifiable → It is formed from "un-" (meaning not), "justus" (from Latin, meaning just or fair), and "facere" (from Latin, meaning to make or do). The word "unjustifiable" means not able to be made just or fair, indicating something that cannot be justified.
Think of 'not' ('un-') being added to 'just' ('justus') and 'to make' ('facere') — this helps you remember that 'unjustifiable' means something that cannot be made fair.