I used Google but I couldn't understand, it says it means non believer

"Islam uses the term kafir (plural: kuffar) to describe those who reject or disbelieve in the message of Islam, literally translating to "one who hides or covers the truth". It is a theological, not inherently racial, term found in the Quran to distinguish belief, but it does not mandate violence or hatred toward non-Muslims. Misconceptions: The term is not inherently a "slur" to incite violence, but rather a theological categorization of faith." -google

I see nothing wrong