Titus 1:16

They profess that they know God, but by their works they deny him, being abominable and disobedient, and for every good work reprobate.

1 John 2:4

He that saith, I know him, and keepeth not his commandments, is a liar, and the truth is not in him.

1 Timothy 5:8

But if any one provideth not for his own, and especially for those of his own house, he hath denied the faith, and is worse than an unbeliever.

2 Timothy 3:5-8

having a form of godliness, but denying the power thereof. And from these turn away.

Jude 1:4

For there have stealthily crept in certain men who were of old appointed beforehand for this condemnation, ungodly men, turning the grace of our God into wantonness, and denying the only Sovereign, and our Lord Jesus Christ.

Revelation 21:8

But the cowardly, and unbelieving, and the polluted with abominations, and murderers, and fornicators, and sorcerers, and idolaters, and all the liars, shall have their part in the lake which burneth with fire and brimstone; which is the second death.

Romans 1:28

And as they did not choose to retain God in their knowledge, God gave them up to a reprobate mind, to do things which are shameful;

Ephesians 5:6

Let no one deceive you with vain words; for because of these things the wrath of God cometh upon the sons of disobedience.

Revelation 21:27

And there shall not enter into it anything unclean, or that worketh abomination and falsehood; but only they that are written in the Lambs book of life.

1 Timothy 1:9

knowing this, that the Law is not made for a righteous man, but for the lawless and unruly, for the ungodly and sinful, for the unholy and profane, for murderers of fathers and murderers of mothers, for manslayers,

Romans 2:18-24

and knowest his will, and approvest the things that are more excellent, being instructed out of 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 knowest his will, and approvest the things that are more excellent, being instructed out of the Law;
2 Timothy 3:5
having a form of godliness, but denying the power thereof. And from these turn away.
Jude 1:4
For there have stealthily crept in certain men who were of old appointed beforehand for this condemnation, ungodly men, turning the grace of our God into wantonness, and denying the only Sovereign, and our Lord Jesus Christ.

Being

Revelation 21:8
But the cowardly, and unbelieving, and the polluted with abominations, and murderers, and fornicators, and sorcerers, and idolaters, and all the liars, shall have their part in the lake which burneth with fire and brimstone; which is the second death.

And disobedient

Ephesians 5:6
Let no one deceive you with vain words; for because of these things the wrath of God cometh upon the sons of disobedience.
1 Timothy 1:9
knowing this, that the Law is not made for a righteous man, but for the lawless and unruly, for the ungodly and sinful, for the unholy and profane, for murderers of fathers and murderers of mothers, for manslayers,

Unto

Romans 1:28
And as they did not choose to retain God in their knowledge, God gave them up to a reprobate mind, to do things which are shameful;
2 Timothy 3:8
Now as Jannes and Jambres withstood Moses, so also do these withstand the truth; men corrupted in their minds, reprobate concerning the faith.