अनाज्ञातम्anājñātamind. in an unknown i.e. inexplicable way or manner TS.
indeclinable in an unknown id est inexplicable way or manner TS.
कोशःDictionaries
Every entry for a word in Apte, Monier-Williams, Macdonell and the Dhātupāṭha, with their abbreviations spelled out, and an analysis of its forms.