'Sinful' in the Bible

see to it, brethren, that there is never in any one of you--as perhaps there may be--a sinful and unbelieving heart, manifesting itself in revolt from the ever-living God.

Moreover we needed just such a High Priest as this--holy, guileless, undefiled, far removed from sinful men and exalted above the heavens;

For the Law appoints men as high priests who are weak [frail, sinful, dying men], but the word of the oath [of God], which came after [the institution of] the Law, permanently appoints [as priest] a Son who has been made perfect forever.

because he preferred to endure the hardship of the people of God rather than to enjoy the passing pleasures of sin.