What is the definition of an authentic hadith?

The Shaykh : ... Because the definition of an authentic hadith in their view is "what is narrated by a precise narrator from one like him, from one like him, to the end of the chain, without being anomalous and without having a defect." So what is narrated by a just, precise narrator from one like him, this means its narrators are trustworthy, but the completion of the definition is "without being anomalous and without having a defect." It may be that there is a break in the chain and it is said that its narrators are trustworthy, and it may be that there is concealment of a defect in the chain and its narrators are trustworthy, and it may be that there is a missing Companion link in the chain and its narrators are trustworthy...

The questioner : The Shaykh : Muhammad Ahmad Shakir.

The Shaykh : What concerns me now is the names, to the extent that it concerns me that you understand what I am saying. Did you understand me?

The questioner: Yes.

The Shaykh : If he saysThe Shaykh : Ahmad orThe Shaykh : Muhammad, who is Ahmad, and I am Muhammad, if I say in a chain that its narrators are trustworthy, I do not mean that it is authentic. When it is authentic, I say its chain is authentic; and peace be upon you.