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iota (noun) an extremely small quantity.
(Used usually in the negative) An iota is not even a small quantity. When you say that he hasn't an iota of common sense, you mean that he has little common sense. 'Try as you might to change him, it won't make an iota of difference in him.' This means that you can never change him. A person hasn't even an iota of respect for you if they do not respect you at all.
- He doesn't bother an iota how his comments hurt others. He is that indifferent.
- She hasn't an iota of love lasting in her for her husband. She is impatient for a divorce.