ʿAdam al-tasmiyah means not giving a name: a narrator is described with a word that does not identify him.
• حَدَّثَنَا رَجُلٌ: A man narrated to us.
• شَيْخٌ: A shaykh.
• ثِقَةٌ: A reliable narrator.
The last word describes reliability, but still does not supply a name.
1. Mubham: a reference that gives no narrator’s name, familiar title or kunyah.