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Definition of sinful : Tainted with, or full of, sin; wicked; iniquitous; criminal; unholy; as, sinful men; sinful thoughts.

Synonyms:

implike, wrong, disgusting, loathly, sordid, diabolic, unrighteous, fiendish, pixilated, prankish, perverted, infernal, arch, deviant, severe, flagitious, unhallowed, disgustful, diabolical, repellant, extraordinary, unsavory, demonic, skanky, yucky, satanic, impish, gross, distasteful, unethical, vile, over-the-top, dark, mischievous, repelling, amoral, guilty, rotten, unlawful, right, hellish, reprobate, illegal, culpable, vicious, puckish, peccant

disgraceful, nefarious, revolting, reprehensible, terrible, detrimental, calamitous, loathsome, repulsive, abominable, sinister, foul, monstrous, evil, bad, offensive, damnable, repugnant, hideous, destructive, heinous, wicked, baneful, atrocious, repellent

depraved, obnoxious, iniquitous, felonious, base, lawbreaking, improper, evildoing, debased, criminal, shocking, sadistic, misdoing, wrongdoing, blameworthy, debauched, immoral, degenerate, perverse, villainous, scandalous, corrupt, black, indecent

sacrilegious, unchristian, atheistic, fallen, irreverent, blasphemous, profane, irreligious, godless, ungodly, impious, unholy, wayward, unfaithful

Usage examples:

• It was not only sentimental in tone but there were mysterious phrases which seemed to hold a deep and sinful significance. - "Almost A Man", Mary Wood-Allen.
• When an ordinary man, a sinful man, dies, he is overcome by the logical result of the sin in himself. - "Quiet Talks about Jesus", S. D. Gordon.
• It seemed a treacherous and sinful thing to hand this man over to a savage throng of white men, perhaps to be lynched on the road. - "The Captain of the Gray-Horse Troop", Hamlin Garland.