An immense variety; innumerable differences. Used to say that things vary widely (e.g., 'people differ greatly').
趣味嗜好は千差万別で、誰にでも好かれるものはない。
Tastes and preferences vary greatly; there's nothing everyone likes.
レビューを見ると、評価は千差万別だ。
If you look at the reviews, the ratings are all over the place.
千差万別の意見をまとめるのは難しい。
It's difficult to summarize opinions that vary so widely.