Merriam-Webster Collegiate Dictionary - glib

 adjective  (~ber; ~best)  Etymology: probably modification of Low German ~berig slippery  Date: 1584  1.  a. marked by ease and informality ; nonchalant  b. showing little forethought or preparation ; offhand ~ answers  c. lacking depth and substance ; superficial ~ solutions to knotty problems  2. archaic smooth, slippery  3. marked by ease and fluency in speaking or writing often to the point of being insincere or deceitful a ~ politician  • ~ly adverb  • ~ness noun