1. not guided by conscience; unscrupulous.
2. not in accordance with what is just or reasonable:
3. excessive; extortionate:
an unconscionable profit.
“I’ve lived most of my life already and I suppose I can argue myself into believing that I have no great cause to love humanity . However, only a few people have hurt me, and if I hurt everyone in return that is unconscionable usury.”
- Isaac Asimov