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Use "untaken" in a sentence
"He vowed to leave no measure untaken, no effort unfulfilled."
"Everybody has to play a version of the counterfactual game at one point or another, but the more this book rehearses the dropped catches and untaken roads and other metaphorical mixtures, the more it succeeds in showing that the pursuit has hit abruptly diminishing returns."
"The big step untaken: reducing the principal on mortgages."