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Use "unformable" in a sentence
"But he mainly counted upon a breathing-space in the Embassy, during which to make more plans as yet unformed and unformable."
"a little vapid and insignificant, with features regular and neat, betraying few characteristics other than the purely negative attributes of a character as yet unformed, possibly unformable; much the sort of a face that he might have expected to see, remembering those thin and pouting lips that before had impressed him."