"trickier" in the adjective sense
1. slippery, tricky
not to be trusted
"how extraordinarily slippery a liar the camera is"- James Agee
2. catchy, tricky
having concealed difficulty
"a catchy question"
"a tricky recipe to follow"
3. crafty, cunning, dodgy, foxy, guileful, knavish, slick, sly, tricksy, tricky, wily
marked by skill in deception
"cunning men often pass for wise"
"deep political machinations"
"a foxy scheme"
"a slick evasive answer"
"sly as a fox"
"tricky Dick"
"a wily old attorney"
Source: WordNet® (An amazing lexical database of English)
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