It is more fun to talk with someone who doesn't use long, difficult words but rather short, easy words like "What about lunch?

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This quote is saying that it is more enjoyable to communicate with someone who uses simple words rather than long and complicated words. For example, instead of asking “When shall we decide on a time to partake in a midday nourishment?”, it is easier to understand the phrase “What about lunch?”. By using shorter, simpler terms, it’s easier to understand what someone is saying and makes conversations more enjoyable.