Source : Webster's Revised Unabridged Dictionary (1913)

Smoothly \Smooth"ly\, adv.
   In a smooth manner.

Source : WordNet®

smoothly
     adv 1: with no problems or difficulties; "put the plans into effect
            quickly and smoothly"
     2: with great ease and success; "in spite of some mishaps,
        everything went swimmingly" [syn: {swimmingly}]
     3: in a smooth and diplomatic manner; "`And now,' he said
        smoothly, `we will continue the conversation'"