Having no conscience, scruples, or moral sense; habitually disregarding conscience or morality.

Having or showing no conscience; acting without regard to right and wrong; unscrupulous.

Having no conscience; acting or inclined to act without regard for what is right; unscrupulous, esp. out of avarice.

Not having, or not regarding, conscience; unconscionable.

= conscienceless, adj.

Probably: without a conscience.

Having no conscience; acting or inclined to act without regard for what is right; unscrupulous. Also: failing to perform one's work or duty well…

Not having a tender conscience; lacking in religious susceptibility. Also transferred. Obsolete.

(un-, prefix1 affix 1.)

Unscrupulous; ready to go any lengths (see length, n. 5b).

Unscrupulous.

Having no scruples, unscrupulous.

In predicative use: not good (in various senses); of no ability, competence, quality, utility, or value; (also, of a person) unscrupulous…

Designating or characteristic of a swindler or shark (shark, n.1 2a); unscrupulous, acquisitive.