He always minces his words when expressing opinions, afraid of offending others.

minces 是动词 mince 的第三人称单数形式。mince 本意是"切碎、剁碎"，引申为"委婉地说、吞吞吐吐地表达"，常用来形容说话时故意含糊其辞或小心翼翼的样子。