1、The speciosity of his promises became clear when he failed to deliver on any of them.
他许下的诺言都是虚假的，当他没有兑现任何一个时，这一点变得清楚了。

2、Don't be fooled by the speciosity of his words; his actions speak louder than his empty promises.
不要被他的言辞所欺骗，他的行动胜过他的空洞承诺。