GLIB

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