IPA: /kənˈsaɪənləs/
KK: /kɑnˈsaɪənləs/
Lacking a sense of right and wrong; showing no moral principles or conscience.
The conscienceless businessman exploited his workers without any guilt.
Conscienceless → It is formed from "conscience" (from Latin "conscientia", meaning knowledge within oneself) and "-less" (meaning without). The word "conscienceless" describes a state of being without a sense of moral awareness or conscience.
Think of having no 'knowledge within' ('conscientia') about right and wrong, which is what it means to be conscienceless.