The description of something by a man as ‘nothing‘ while he means that it is not true

Narrated 'Aisha:

Some people asked Allah's Apostle about the fore-tellers. Allah's Apostle ﷺ said to them, "They are nothing (i.e., liars)." The people said, 'O Allah's Apostle ! Sometimes they tell something which comes out to be true." Allah's Apostle ﷺ said, "That word which comes to be true is what a jinx snatches away by stealing and then pours it in the ear of his fore-teller with a sound similar to the cackle of a hen, and then they add to it one-hundred lies."

حَدَّثَنَا مُحَمَّدُ بْنُ سَلاَمٍ، أَخْبَرَنَا مَخْلَدُ بْنُ يَزِيدَ، أَخْبَرَنَا ابْنُ جُرَيْجٍ، قَالَ ابْنُ شِهَابٍ أَخْبَرَنِي يَحْيَى بْنُ عُرْوَةَ، أَنَّهُ سَمِعَ عُرْوَةَ، يَقُولُ قَالَتْ عَائِشَةُ سَأَلَ أُنَاسٌ رَسُولَ اللَّهِ ﷺ عَنِ الْكُهَّانِ فَقَالَ لَهُمْ رَسُولُ اللَّهِ ﷺ " لَيْسُوا بِشَىْءٍ ". قَالُوا يَا رَسُولَ اللَّهِ فَإِنَّهُمْ يُحَدِّثُونَ أَحْيَانًا بِالشَّىْءِ يَكُونُ حَقًّا. فَقَالَ رَسُولُ اللَّهِ ﷺ " تِلْكَ الْكَلِمَةُ مِنَ الْحَقِّ يَخْطَفُهَا الْجِنِّيُّ، فَيَقُرُّهَا فِي أُذُنِ وَلِيِّهِ قَرَّ الدَّجَاجَةِ، فَيَخْلِطُونَ فِيهَا أَكْثَرَ مِنْ مِائَةِ كَذْبَةٍ ".