glib

Fluent and confident, but not sincere or thoughtful.

Glib often describes a reply, apology, or speaker that sounds smooth but seems shallow or insincere. It is usually critical and can suggest that the speaker has not thought deeply about what they are saying.

• When I asked how she would fix the delay, she gave me a glib answer and changed the subject.
• His apology sounded glib, as if he wanted to end the conversation rather than make things right.
• The presenter made a glib joke about the mistake, but the team was still worried.