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doubtful▼(subject to, or causing doubt)adjective[UK: ˈdaʊt.fʊl] [US: ˈdaʊt.fəl]
dubious▼(arousing doubt)adjective[UK: ˈdjuː.bɪəs] [US: ˈduː.biəs]
iffy [iffier, iffiest]▼(Of dubious authenticity, legitimacy or legality)adjective[UK: ˈɪ.fi] [US: ˈɪ.fi]
suspicious▼(arousing suspicion)adjective[UK: sə.ˈspɪ.ʃəs] [US: sə.ˈspɪ.ʃəs]
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