Then as now, inside the Washington Beltway hubris and glibness go hand in hand.
Seeing it written down, it looks dangerously close to glibness.
The men in The Group behave with glibness, condescension, and even brutality toward the Vassar grads.
1590s, "smooth and slippery," possibly a shortening of obsolete glibbery "slippery," which is perhaps from Low German glibberig "smooth, slippery," from Middle Low German glibberich, from or related to glibber "jelly." Of words, speakers, etc., from c.1600. Related: Glibly; glibness.