glib

他的回答听起来很圆滑，但明显缺乏深度。

His ___glib response sounded smooth but clearly lacked depth.

推销员关于保证收益的油滑宣传骗了好几位老年投资者。

The salesman's ___glib pitch about guaranteed returns fooled several elderly investors.

她那句油滑的道歉——'很抱歉让你有这种感受'——反而让情况更糟了。

Her ___glib apology—'sorry you feel that way'—only made things worse.