This study was designed to explore the delicate semantic similarities and differences among three near-synonym adjectives. To achieve this goal, this study tried to conduct a new approach with COCA as a target corpus and two analysis tools like Wmatrix 5 and NetMiner 4.0. This study took three steps. It explored the noun collocates of three near-synonym adjectives extracted from COCA, identified the semantic domains of noun collocates using Wmatrix 5, and finally examined how the semantic domains shared or unshared with three near-synonym adjectives through network analysis using NetMiner 4.0. In this study, only two options were chosen to explicitly explore the semantic similarities and differences of all three near-synonym adjectives: one is semantic domains shared with all near-synonym adjectives, and the other is semantic domains exclusively shared with each near-synonym adjective. The findings showed that there were the clear semantic similarities and differences in the authentic usage of three near-synonym adjectives in the COCA-based contexts. Additionally, it is well expected that much more detailed and genuine information of near-synonym adjectives could be provided by the new approach.