full of wiles and tricks, match between persons equal in shrewdness mobilizing all the tricks each can muster, shrewdly avoiding the opponent's strong points and attacking its weaknesses
虚弱【きょじゃく】
feebleness, weakness, imbecility
虚実【きょじつ】
falsehood and truth, fiction and fact
虚心【きょしん】
open-minded, receptive, free from preconceived ideas