• تَعْبَثُونَ
• عَبَث

Appears 2 times in the Quran.

1. 23:115 أَفَحَسِبْتُمْ أَنَّمَا خَلَقْنَٰكُمْ عَبَثًا وَأَنَّكُمْ إِلَيْنَا لَا تُرْجَعُونَ

   What! did you then think that We had created you in vain and that you shall not be returned to Us?
   

2. 26:128 أَتَبْنُونَ بِكُلِّ رِيعٍ ءَايَةً تَعْبَثُونَ

   Do you build on every height a monument? Vain is it that you do: