His uprightness gained him the trust of his colleagues.

uprightness 是由形容词 upright（正直的、直立的）加上名词后缀 -ness 构成的名词。upright 由 up（向上）和 right（直的、正确的）组成，字面意思是"笔直向上的"，引申为"正直的"。uprightness 表示"正直、诚实"的品质。