Titus 1:16

They profess to know God, but they deny him by their deeds; they are detestable and disobedient, unfit for any good deed.

1 John 2:4

He who says, "I know him," but does not keep his commandments, is a liar, and the truth is not in him.

1 Timothy 5:8

If any one does not provide for his relatives, and especially for his own family, he has denied the faith and is worse than an unbeliever.

2 Timothy 3:5-8

holding a form of godliness but denying its power. Avoid such people.

Jude 1:4

For certain persons have crept in secretly, those who were long ago marked out for this condemnation, ungodly persons who turn the grace of our God into licentiousness and deny our only Master and Lord, Jesus Christ.

Revelation 21:8

But as for the cowardly, the unbelieving, the immoral, as for murderers, fornicators, sorcerers, idolaters, and all liars, their lot will be in the lake that burns with fire and sulfur, which is the second death."

Romans 1:28

And since they did not see fit to retain the knowledge of God, God gave them over to a base mind, to do what ought not to be done.

Ephesians 5:6

Let no one deceive you with empty words, for because of these things the wrath of God comes upon the sons of disobedience.

Revelation 21:27

Nothing unclean shall enter it, nor any one who practices abomination or falsehood, but only those whose names are written in the Lamb's book of life.

1 Timothy 1:9

realizing the fact that law is not made for a righteous person, but for those who are lawless and rebellious, for the ungodly and sinners, for the unholy and profane, for those who kill their fathers or mothers, for murderers

Romans 2:18-24

and know his will and approve of what is excellent, because you are instructed in the law,

Treasury of Scripture Knowledge

Summary

They profess that they know God; but in works they deny him, being abominable, and disobedient, and unto every good work reprobate.

And disobedient

Bible References

Profess

Romans 2:18
and know his will and approve of what is excellent, because you are instructed in the law,
2 Timothy 3:5
holding a form of godliness but denying its power. Avoid such people.
Jude 1:4
For certain persons have crept in secretly, those who were long ago marked out for this condemnation, ungodly persons who turn the grace of our God into licentiousness and deny our only Master and Lord, Jesus Christ.

Being

Revelation 21:8
But as for the cowardly, the unbelieving, the immoral, as for murderers, fornicators, sorcerers, idolaters, and all liars, their lot will be in the lake that burns with fire and sulfur, which is the second death."

And disobedient

Ephesians 5:6
Let no one deceive you with empty words, for because of these things the wrath of God comes upon the sons of disobedience.
1 Timothy 1:9
realizing the fact that law is not made for a righteous person, but for those who are lawless and rebellious, for the ungodly and sinners, for the unholy and profane, for those who kill their fathers or mothers, for murderers

Unto

Romans 1:28
And since they did not see fit to retain the knowledge of God, God gave them over to a base mind, to do what ought not to be done.
2 Timothy 3:8
Just as Jannes and Jambres opposed Moses, so these men also oppose the truth, men of depraved mind, rejected in regard to the faith.