What is the correct synonym or meaning-equivalent ('Sambhinnarthak') of the word 'अभिज्ञ' (Abhijna)?

The prefix 'अ-' in 'अभिज्ञ' combines with the root meaning to signify "one who knows" or "possesses knowledge about a topic". Therefore, its accurate meaning-equivalent is 'जानकार' (Jankar). Its opposite is 'अनभिज्ञ' (ignorant).