an extremely small amount
iota - bit
An ‘iota’ is a scarcely detectable amount of something. The word is typically used to emphasize the lack of something and implies a sense of frustration or disappointment. It is most commonly encountered in a professional context and is usually preceded by either ‘one’ or ‘an’.
Adam said that the data loss was due to Maria’s mishandling of the transfer, but I haven’t seen one iota of evidence to back up his claim.
My son will not take over my business when I retire. He does not even have an iota of interest in running a shop.
I knew they were making the wrong decision, but nothing I said seemed to make an iota of difference.