akathya
akathya — unspeakable; CC Adi 5.217
akathya kathana — inconceivable description; CC Adi 10.3
akathya-kathana — indescribable by words; CC Madhya 7.30
akathya — inexplicable; CC Madhya 8.207
akathya kathana — inconceivable incident; CC Antya 3.71