Some individuals are skilled at developing wholesome interpersonal relationships and they adjust well to society, whereas others display inadequate psychological adaptation that might be caused by trying too hard to develop good interpersonal relationships, which is known as over-adaptation. Over-adaptation is defined as "Obeying the demands and expectations of the environment to a degree close to perfection and working hard to meet the expectations and a demands of the situation, even to the extent of forcibly suppressing internal desires" (ishizu, 2006). The purpose of this research was to examine the influence of over-adaptation on intimacy, ini order to identify its effect on establishing close relationships. Undergraduates (N = 369; 123 men and 246 women) participated in the study. Results indicated that "Self inhibition" and "Self doubt" in over-adaptation had a positive influence on intimacy.