<![CDATA[Multilingualism is increasingly common among young adults, providing a variety of cognitive impacts that affect vocabulary processing and language comprehension. Although multilingualism has benefits for cognitive flexibility, complex cognitive processes can result in challenges in proper word selection as well as language comprehension, especially when switching languages. This study aims to explore how multilingualism has an impact on vocabulary processing and language comprehension in young adults, with a focus on the phenomenon of language interference. Using a qualitative method with a case study approach, data were collected through in-depth interviews with a group of young adults who mastered more than one language. Thematic analysis was applied to identify key patterns in their language processing experience. The results showed that multilingual young adults often face "tip of the tongue" and difficulties in accessing vocabulary due to interlingual competition in their cognitive systems. In addition, language comprehension was better in more frequently used languages, while infrequently used languages showed a decrease in comprehension ability. The conclusions of this study support the theory of Inhibitory Control and Competition Model, which explains how multilingualism involves a complex process of word selection. In practical terms, this study suggests the development of learning strategies that can reduce language interference, for example through intensive vocabulary practice. The implications of this study include guidance for educators in designing language curricula that are more effective and responsive to the challenges faced by multilingual individuals.]]>
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