'Sinful' in the Bible

Certainly not! Let God be found true [as He will be], though every person be found a liar, just as it is written [in Scripture],“That You may be justified in Your words,And prevail when You are judged [by sinful men].”

When we were living in the flesh [trapped by sin], the sinful passions, which were awakened by [that which] the Law [identifies as sin], were at work in our body to bear fruit for death [since the willingness to sin led to death and separation from God].

For what the Law could not do [that is, overcome sin and remove its penalty, its power] being weakened by the flesh [man’s nature without the Holy Spirit], God did: He sent His own Son in the likeness of sinful man as an offering for sin. And He condemned sin in the flesh [subdued it and overcame it in the person of His own Son],

But he who is uncertain [about eating a particular thing] is condemned if he eats, because he is not acting from faith. Whatever is not from faith is sin [whatever is done with doubt is sinful].