What does he is hard as a rock and about as human mean?

The phrase "he is hard as a rock and about as human" suggests that the person being described is emotionally or psychologically very tough and unyielding, resembling an inanimate object rather than a compassionate, empathetic human being. It implies a lack of warmth or vulnerability, suggesting that the individual may be unapproachable or indifferent to the feelings of others. Overall, it conveys a sense of emotional rigidity and a disconnect from human qualities like empathy and kindness.