The purpose of this study was to investigate attrition effects in a group of L1-Greek–L2-English speakers and to explore their views on attrition and their feelings about their own use of both languages. The first part (n = 32) was a psycholinguistic study measuring semantic and formal verbal fluency which was part of a broader project. The second part (n = 14) was a sociolinguistic study of semi-structured interviews aiming to gain insights into participants’ lived experiences of attrition. In verbal fluency, monolinguals outperformed bilinguals in the number of correct responses in both semantic and formal fluency. The analysis of the interview transcripts suggested that attriters experience attrition negatively, as a loss of a competence they once had, with two types of negative experiences emerging more prominently: (a) the realisation that they have difficulties with lexical retrieval and (b) stigmatising and judgemental comments by (non)-attriters. Combining quantitative and qualitative methods, this study on attriters can give us unique insights into their lived experience of attrition.