Naradhama means lowest of the mankind. Why lowest of the mankind? Because mankind means those who are interested to understand God. That is mankind. Otherwise “dog-kind.” The dogs and asses, they are not interested to know what is God. It is the prerogative of the human being to understand what is God. Therefore a man who has got this human form of body does not inquire about God, he is naradhama, the lowest of the mankind. Na mam duskrtino mudhah. And rascal, ass. Na mam duskrtino mudhah prapadyante naradhamah mayayapahrta-jnanah [Bg. 7.15].

Srila Prabhupada, Talk on Bhagavad-gita 12.13-14 — May 12, 1974, Bombay