Superlative form of tricky: most tricky.(adjective)
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Use "trickiest" in a sentence
"Scott put the blame for the early miscues on not picking up on the ice, which she called the trickiest of any Scotties in which she's played."
"Scott put the blame for the early miscues on not picking up on the ice, which she called the trickiest of any Scotties she's played."
"What I often find trickiest is correcting misinformation that is being spoken by a woman who was not able to successfully breastfeed her child (or by her partner, friend, mother, sister, etc.)."