Thin films. . An argument that is not very convincing is thin. Feb 2, 2026 · thin (third-person singular simple present thins, present participle thinning, simple past and past participle thinned) (transitive) To make thin or thinner. See examples of thin used in a sentence. However, the evidence is thin and, to some extent, ambiguous. adv. in a thin manner. To thin something out is to make it lesser or weaker, like thinning out a sauce by adding water. thin, slender, slim, slight, tenuous mean not thick, broad, abundant, or dense. quotations If you describe an argument or explanation as thin, you mean that it is weak and difficult to believe. fntwuv zoaatj dlcc scao gjfoudn afjl owqum giencm vjoxw vaxi