Na-adjective (keiyodoshi), Noun
clever; bright; sharp; wise; intelligent; sagacious
see 利口
そういう相手の前では、私の見せ掛けだけの怜悧な技術は、見抜かれた時に負けていたと思う。I think that against somebody like that, my seemingly clever techniques would be seen through and then I would be defeated.
Also written 伶俐【れいり】