Superlative form of frisky: most frisky.(adjective)
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Use "friskiest" in a sentence
"Well, if it was, it was the warmest-bodied, friskiest, most solid spook there ever was."
""The smallest, friskiest ones, I think, are young ladies, by the way they switched along behind the others and hung back kind of shy-like.""
""And I'll tell you how this same lady induced me to put on those foolish togs and hire the friskiest horse at Clayton's," further volunteered Shirley."