Glib (adjective) — فصيح متدفق: Speaking smoothly but without sincerity or depth. Below are 8 words with a similar meaning; the linked ones have full GL Dictionary entries with their meaning in Arabic.
Easily done but without depth; too simple.
Existing or occurring at the surface; not thorough or deep.
Able to speak or write a language smoothly and easily.
Not expressing true feelings; false.
Difficult to hold or stand on because of being smooth or wet; untrustworthy.
Not showing a serious or respectful attitude.
slicksmooth-talking
Treating serious issues with inappropriate humour.