His craftiness in tricking everyone was truly remarkable.

craftiness 是名词，由形容词 crafty（狡猾的）加上名词后缀 -ness 构成。crafty 来自名词 craft（手艺、技巧），引申为"狡猾、诡计多端"的意思。craftiness 指"狡猾、诡计多端的特质或行为"。