[BloofPailafum]

Peace,
Here a defination from Quran: associating with Allah, for which he hath given no authority; and saying things about Allah of which ye have no knowledge.



قُلۡ إِنَّمَا حَرَّمَ رَبِّىَ ٱلۡفَوَٲحِشَ مَا ظَهَرَ مِنۡہَا وَمَا بَطَنَ وَٱلۡإِثۡمَ وَٱلۡبَغۡىَ بِغَيۡرِ ٱلۡحَقِّ وَأَن تُشۡرِكُواْ بِٱللَّهِ مَا لَمۡ يُنَزِّلۡ بِهِۦ سُلۡطَـٰنً۬ا وَأَن تَقُولُواْ عَلَى ٱللَّهِ مَا لَا تَعۡلَمُونَ (٣٣)


Say: The things that my Lord hath indeed forbidden are: shameful deeds, whether open or secret; sins and trespasses against truth or reason; associating with Allah, for which he hath given no authority; and saying things about Allah of which ye have no knowledge. (7-33)






I agree with your understanding; however, what do you mean by "without Proof"?

Peace

brother what if something is within the boundaries set by the ayah but still has no proof from the sahabah and tabieen would that still be a evil biddah.

do you believe that there are two types of biddah if no i can provide refrences from famous scholars.