Etymology
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glib (adj.)

1590s, "smooth and slippery," a dialect word, 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," all part of the Germanic group of gl- words for "smooth, shining, joyful," from PIE root *ghel- (2) "to shine." Of words, speakers, etc., from c. 1600. Related: Glibly; glibness.

updated on October 14, 2021

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Definitions of glib from WordNet

glib (adj.)
marked by lack of intellectual depth;
a glib response to a complex question
glib generalizations
glib (adj.)
having only superficial plausibility;
glib promises
Synonyms: pat / slick
glib (adj.)
artfully persuasive in speech;
a glib tongue
Synonyms: glib-tongued / smooth-tongued
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.