not scrupulous; unrestrained by scruples; conscienceless; unprincipled.

adjective

ethical , good , moral , principled , scrupulous

adjective

arrant , base , casuistic , conscienceless , corrupt , crafty , crooked , deceitful , degraded , degrading , disgraceful , dishonest , dishonorable , exploitative , illegal , improper , low-down * , mercenary , perfidious , petty , questionable , recreant , ruthless , scandalous , scheming , selfish , self-seeking , shady , shameless , shifty , sinister , slippery , sly , two-faced * , unconscientious , unconscionable , underhand , underhanded , unethical , unfair , unprincipled , unworthy , venal , wicked , wrongful , devious , immoral , knavish