What is a good and perfected Hadith?

The description "jayyid" (good) or "mujawwad" (well-authenticated) is used for accepted hadith, which includes both sahih (sound) and hasan (good) categories.

Al-Suyuti states in his Alfiyyah that the terms "jayyid," "thabit" (established), "salih" (suitable), and "mujawwad" are applied to accepted hadith that fall between sahih and hasan.

Sometimes, "jayyid" may be used synonymously with "sahih," even though "sahih" holds a higher rank.

As for the early scholars (al-Mutaqaddimun), they used the term "tajwid" to refer to tadlis al-taswiyah, which is the worst type of tadlis (deception in transmission). It involves dropping a weak narrator between two trustworthy narrators in the chain of transmission, making the entire chain appear to consist of trustworthy narrators. This type of tadlis harms the hadith and is considered a disparagement of the narrator.