IPA: //dɪsˈɪntrəstɪd//
KK: /dɪsˈɪntrəstɪd/
Not influenced by personal feelings or interests; impartial and unbiased.
The judge was disinterested in the case, making a fair decision based solely on the evidence presented.
Disinterested → It is formed from "dis-" (meaning apart) and "interesse" (from Latin, meaning to be between or to concern). The word originally referred to being impartial or not having a personal stake in a matter, hence being 'apart' from any interest.
Think of being 'apart' ('dis-') from any 'concern' ('interesse') in a situation, which helps you remember that 'disinterested' means being impartial or unbiased.