There are many unverified news stories on social media, so don't believe them easily.

unverified 是由前缀 un-（表示"否定"）和动词 verify（核实、验证）的过去分词 verified 组成的形容词。verify 来自拉丁语 verus（真实的），加上后缀 -fy（使...化）。unverified 整体意思是"未经核实的"。