This repository is for the manuscript: "Kind Words Do Not Become Tired Words: Undervaluing the Positive Impact of Frequent Compliments" by Xuan Zhao & Nicholas Epley, currently under revision at *Self and Identity*. This repository contains: (1) all study materials, including surveys, study protocol, and Qualtrics files; (2) data; (3) analyses in R code; (4) analyses outputs as RMarkdown/HTML files. Abstract: Belonging is a basic need satisfied by signals of warmth and appreciation. Compliments can satisfy others’ need to belong, but recent research suggests that people may underestimate their positive impact on recipients, creating a barrier to giving them more often. Here we assess how people expect compliment recipients to react to receiving multiple compliments over time, compared to the actual experience of recipients. Although people generally expect recipients to adapt to multiple compliments, with each compliment feeling a little less positive and sincere (Experiment 1), an experiment (Experiment 2) in which one person from an acquainted pair received one new compliment for five consecutive days found no evidence of adaptation. Expressers in this experiment also underestimated how positive their recipients would feel overall. An additional experiment (Experiment 3) examining only peoples’ expectations found that people expected less adaptation among recipients when they saw the actual compliments shared in Experiment 2, suggesting that mistaken beliefs about adaptation may stem from an abstract sense that multiple compliments are more similar to each other than they actually are. Belonging is a need that can be satisfied by repeated signs of warmth and appreciation. Underestimating their power may lead people to refrain from expressing these signs more often in daily life.