The Eight Sins that send one to Hell.

The Complete Word Study Dictionary: New Testament 571. ἄπιστος ápistos

571. ἄπιστος ápistos; gen. apístou, masc.–fem., neut. ápiston, adj. from a (1), without, and pistós (4103), believing, faithful. Not worthy of confidence, untrustworthy. In the NT in a pass. sense, a thing not to be believed, incredible (Acts 26:8); in an act. sense, not believing (Matt. 17:17; Mark 9:19; Luke 9:41; 12:46; John 20:27). Denotes one who disbelieves the gospel of Christ, an unbeliever, infidel (1 Cor. 6:6; 7:12–15; 10:27; 14:22–24; 2 Cor. 4:4; 6:14, 15; 1 Tim. 5:8; Titus 1:15; Rev. 21:8; Sept.: Is. 17:10).

Revelation 21:8 KJV 1900

But the fearful, and unbelieving, and the abominable, and murderers, and whoremongers, and sorcerers, and idolaters, and all liars, shall have their part in the lake which burneth with fire and brimstone: which is the second death.

2 Corinthians 4:4 KJV 1900

In whom the god of this world hath blinded the minds of them which believe not, lest the light of the glorious gospel of Christ, who is the image of God, should shine unto them.

Titus 1:15 KJV 1900

Unto the pure all things are pure: but unto them that are defiled and unbelieving is nothing pure; but even their mind and conscience is defiled.

2 Corinthians 6:14 KJV 1900

Be ye not unequally yoked together with unbelievers: for what fellowship hath righteousness with unrighteousness? and what communion hath light with darkness?

2 Corinthians 6:15 KJV 1900

And what concord hath Christ with Belial? or what part hath he that believeth with an infidel?

571. ἄπιστος ápistos; gen . apístou, masc.–fem., neut. ápiston, adj . from a (1), without, and pistós (4103), believing, faithful. Not worthy of confidence, untrustworthy. In the NT in a pass. sense, a thing not to be believed, incredible (Acts 26:8); in an act. sense, not believing (Matt. 17:17; Mark 9:19; Luke 9:41; 12:46; John 20:27).

Denotes one who disbelieves the gospel of Christ, an unbeliever, infidel (1 Cor. 6:6; 7:12–15; 10:27; 14:22–24; 2 Cor. 4:4; 6:14, 15; 1 Tim. 5:8; Titus 1:15; Rev. 21:8;Is. 17:10). Note that this not two groups [scardy cats + unbelieving; but those who have the two spiritual diseases.] They are also abominable! And grouped as guiltily with the other six groups of condemned.

Unbelievers are called by Jesus as darkness and sons of Belial [wickedness] personified! 8 mortal sins.

The 10 spies bringing back the evil report to Joshua were of this sort: and spread their contagion to all the children of Israel.

Zodhiates, S. (2000) The complete word study dictionary: New Testament