Ticklish describes a physical reaction that often results in laughter when touched. When I tickled her ribs, she laughed because she was very ticklish.
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Varying Intensity
People have varying levels of ticklishness; some are extremely ticklish, others may not react at all. Although his sister is quite ticklish, he is not ticklish at all.
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Common Areas
Ticklish often refers to certain body parts that are commonly sensitive, like feet, sides, or underarms. His feet are ticklish, so he always laughs during foot massages.