He was sure-footed during the negotiation and never made a mistake.

sure-footed 是由形容词 sure（确定的、稳当的）和名词 foot（脚）加上后缀 -ed 组成的复合形容词。字面意思是"脚步稳当的"，引申为"稳健的、可靠的"。形容人在行动或决策时表现得沉着自信、不易出错。