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flim·sy / ˈflimzē/ • adj. (-si·er, -si·est) comparatively light and insubstantial; easily damaged: voyagers who crossed the sea in flimsy boats. ∎  (of clothing) light and thin: I wore flimsy clothes and needed warming. ∎  (of a pretext or account) weak and unconvincing: a pretty flimsy excuse.• n. (pl. -sies) Brit. a document, esp. a copy, made on very thin paper: credit-card flimsies. ∎  very thin paper: sheets of yellow flimsy.DERIVATIVES: flim·si·ly / ˈflimzəlē/ adv.flim·si·ness / -zēnis/ n.