せんさばんべつ· also せんさまんべつ
an infinite variety of; multifarious; being extremely varied and wide-ranging
Na-adjective, No-adjective, Noun
一口ひとくちに英会話えいかいわ教材きょうざいといっても、千差万別せんさばんべつだ。
They all get lumped together as English texts. But in fact these books are extremely varied and wide-ranging.