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un·bound1 / ˌənˈbound/ • adj. not bound or tied up: her hair was unbound | fig. they were unbound by convention. ∎  (of printed sheets) not bound together. ∎  (of a book) not provided with a proper or permanent cover. ∎ Chem. & Physics not held by a chemical bond, gravity, or other physical force: unbound electrons.un·bound2 • past and past participle of unbind.