2 Timothy 4:2-4 NLT
2 Preach the word of God. Be prepared, whether the time is favorable or not. Patiently correct, rebuke, and encourage your people with good teaching. 3 For a time is coming when people will no longer listen to sound and wholesome teaching. They will follow their own desires and will look for teachers who will tell them whatever their itching ears want to hear. 4 They will reject the truth and chase after myths.
What is truth?
Psalm 119:160 NKJV
The entirety of Your word is truth, And every one of Your righteous judgments endures forever.
Matthew 4:4 NKJV
But He answered and said, “It is written, ‘Man shall not live by bread alone, but by every word that proceeds from the mouth of God.’ ”
John 17:17 NKJV
17 Sanctify them by Your truth. Your word is truth.
So Paul says that a time is coming when people will reject what's actually written in the torah, writings, and prophets (the truth); and look for teachers that are telling them what they want to hear. We see that today in full force.
The word "truth" is another word for the Holy Scriptures. So these people claim to love Jesus Christ, but reject (and in some cases insult) parts of his character; since he is the Word made Flesh (John 1:14). Teaching deception and rejecting the truth leads to lawlessness, which leads to judgement if un-repented.