Superlative form of sniffy: most sniffy.(adjective)
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Use "sniffiest" in a sentence
"Two tiny girls, Amy and Irie, played in the sandbox all the time, sharing scraped knees and getting into the kind of tussles you'd expect from little, innocent children, their bright, shining eyes hiding not the sniffiest whiff of mischief."
"With a Royce you will be accepted, or at least tolerated, by the sniffiest grandee - and for considerably less than a duckpond, let alone a manor house."
"Gallas couldn't be a very useful addition to any squad, despite his penchant for embarking on sulks that are monumental even by the standards of the sniffiest French toddler."