not guided by conscience; unscrupulous.

not in accordance with what is just or reasonable

unconscionable behavior.

excessive; extortionate

an unconscionable profit.

adjective

decent , good , moral , principled

adjective

amoral , barbarous , conscienceless , criminal , dishonest , excessive , exorbitant , extravagant , extreme , inordinate , knavish , outrageous , preposterous , sneaky , too much * , uncivilized , undue , unethical , unfair , ungodly , unholy , unjust , unprincipled , unreasonable , unscrupulous , wanton , wicked , ruthless , obscene , ridiculous , shocking , sky-high , stiff , stratospheric , immoderate , immoral , inexcusable , unjustified , unwarranted