The Greek in Acts 4:25 that is translated as «vain things» or similar in English is translated in the following ways:

• «as vain things plan together but in vain» (Chuj)
• «imagining many things which they were not able to do» (Morelos Nahuatl)
• «think up things that are not at all important» (Central Pame)
• «tried to do God bad but in vain» (Highland Popoluca)
• «that evil they think to do will never be carried out» (Mezquital Otomi)
• «think a lot about big things but can’t do them» (Tataltepec Chatino (Source for this and above: Viola Waterhouse in Notes on Translation August 1966, p. 86ff.)