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New thiosemicarbazone derivatives (1–10) were obtained via the reaction of 4-(naphthalen-1-yl)thiosemicarbazide with fluoro-substituted aromatic aldehydes. The synthesized compounds were evaluated for their in vitro antifungal effects against pathogenic yeasts and molds using broth microdilution assay. Ames and umuC assays were carried out to determine the genotoxicity of the most effective antifungal derivatives. Furthermore, all compounds were evaluated for their cytotoxic effects on A549 human lung adenocarcinoma and NIH/3T3 mouse embryonic fibroblast cell lines using XTT test. Among these derivatives, 4-(naphthalen-1-yl)-1-(2,3-difluorobenzylidene)thiosemicarbazide (1) and 4-(naphthalen-1-yl)-1-(2,5-difluorobenzylidene)thiosemicarbazide (3) can be identified as the most promising antifungal derivatives due to their notable inhibitory effects on Candida species and no cytotoxicity against NIH/3T3 …