ψεύστης

John 8:44 ψεύστης a liar

You belong to your father, the devil, and you want to carry out his desires. He was a murderer from the beginning, refusing to uphold the truth, because there is no truth in him. When he lies, he speaks his native language, because he is a liar and the father of lies.

Here: A label for a person: someone who is a liar by nature, not someone who told one lie.

John 8:55 ψεύστης· a liar;

You do not know Him, but I know Him. If I said I did not know Him, I would be a liar like you. But I do know Him, and I keep His word.

Here: A noun, not a verb: not 'I would be lying' but 'I would be a liar', a person defined by falsehood. It reuses the word from 8:44, where the devil is 'a liar and the father of it'.

Romans 3:4 ψεύστης a liar

Certainly not! Let God be true and every man a liar. As it is written: “So that You may be proved right when You speak and victorious when You judge.”

Here: Someone who speaks falsely, and by extension someone who cannot be relied on. It is the opposite of 'true', and here it echoes the 'unfaithfulness' of verse 3.

1 Timothy 1:10 ψεύσταις, for liars,

for the sexually immoral, for homosexuals, for slave traders and liars and perjurers, and for anyone else who is averse to sound teaching

Here: A person who habitually speaks falsehood. With the next word it stands for the commandment against bearing false witness.

Titus 1:12 ψεῦσται, liars,

As one of their own prophets has said, “Cretans are always liars, evil beasts, lazy gluttons.”

1 John 1:10 ψεύστην a liar

If we say we have not sinned, we make Him out to be a liar, and His word is not in us.

Here: Placed first in its clause for emphasis: 'a liar is what we make him.' It is a shocking word to use of God, and that is the point.

1 John 2:4 ψεύστης a liar

If anyone says, “I know Him,” but does not keep His commandments, he is a liar, and the truth is not in him.

Here: A liar, someone whose words do not match reality. The word comes first in its clause for emphasis: "a LIAR he is." In John's writings the word also places a person on the side of falsehood (John 8:44).

1 John 2:22 ψεύστης liar

Who is the liar, if it is not the one who denies that Jesus is the Christ? This is the antichrist, who denies the Father and the Son.

Here: A liar. In John's writings this means someone who belongs to the realm of falsehood, the opposite of 'the truth' that the readers know (v. 21). It is more than someone who has made a mistaken statement.

1 John 4:20 ψεύστης a liar

If anyone says, “I love God,” but hates his brother, he is a liar. For anyone who does not love his brother, whom he has seen, cannot love God, whom he has not seen.

Here: A blunt label. Not just 'mistaken': his claim is false, and in this letter liars line up against the truth (2:4, 22).

1 John 5:10 ψεύστην a liar

Whoever believes in the Son of God has this testimony within him; whoever does not believe God has made Him out to be a liar, because he has not believed in the testimony that God has given about His Son.

Here: Placed first in its clause for emphasis: 'a LIAR he has made him'. To refuse a witness's sworn statement is to treat the witness as false.