His petitness of character made his colleagues reluctant to work with him.

petitness 是名词，由形容词 petty（小气的、狭隘的）加上名词后缀 -ness 构成，表示"小气、狭隘"的性格特征。petty 本身来自古法语 petit（小的），引申为"心胸狭窄的"。 petitness of character 指"性格上的小气狭隘"，形容一个人斤斤计较、心胸狭窄的特质。