What have scholars said in regards to the definition of a (شاذ) Hadith: هو مخالفة الثقة للثقات?

A Shadh (شاذ) Hadith is the differing of a Maqbool narrator with that narrator which is more Mawthooq/trustworthy than him. But as is found in some books on the Mustalah, it says that Shadh (الشاذ) is the differing of a Mawthooq/reliable/trustworthy narrator with other narrators which are also mawthooq (هو مخالفة الثقة للثقات). So what have scholars of hadith said in regards to this?