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noun [ U ] uk /ʌnˈfeɪθ.fəl.nəs/ us /ʌnˈfeɪθ.fəl.nəs/
(Definition of “unfaithful” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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to make a surface shiny by putting a liquid substance onto it and leaving it or heating it until it dries