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softbound

a. (context of a book English) With a cover of flexible paper rather than a rigid cardboard cover.

Usage examples of "softbound".

Since it fell into a public domain document, any publisher could bring it out under any lurid cover it liked, softbound, hardbound, mass-market, or trade-size editions.

But four copies is not much, considering that at one time more than fifty thousand hardbound and three hundred thousand softbound copies were in circulation.