Superlative form of tricksy: most tricksy.(adjective)
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Use "tricksiest" in a sentence
"Spearhead is the tricksiest; it doesn't have the Master, and I don't recall it having some of the wilder action sequences that came to be the hallmark of the Pertwee series, but it is a nice tie-in to the new Doctor Who because of its villain, and it's a good, speedy episode."
"I actually tried it today, with my tricksiest group."