irrecognizable UK /ɪˈɹɛkə(ɡ)naɪzəbəl/US /ɪˈɹɛkəɡnaɪzəbəl/ adjective1 •(no longer used, rare) Unable to be recognized.The immortal gods are there (quite irrecognizable under these disguises), and also the lowest broken valets. — 1850