Superlative form of shifty: most shifty.(adjective)
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Use "shiftiest" in a sentence
"The audience seemed to be having a hard time taking his wickedness seriously; his shiftiest moments elicited laughs."
"During the 14 years that compounds like AIDSVax have been knocking around in labs, researchers have learned that gp 120 is the shiftiest part of the virus."
"A gigantic necklace of glowing jewels, the Pr/de was the biggest, fastest, shiftiest, most deadly ship ever to carry the colors of the Alban hopes of the Alban Empire."