Superlative form of smarmy: most smarmy.(adjective)
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Use "smarmiest" in a sentence
"Why He Should Return: With his ties to Sawyer and the recently deceased John Locke, Cooper is one of the show's smarmiest villains, and a brilliantly written one to boot."
"“Don't I know it,” I say, giving him the smarmiest grin I can muster."
"The fact that you idiots are tripping over yourselves to come up with the smarmiest quip to describe what a joke she is and how you are not afraid of her is proof positive that you are all crapping your pants right now."