/ ˈsmuːðli; NAmE / adverb
1.
in an even way, without suddenly stopping and starting again :
Traffic is now flowing smoothly again.
The engine was running smoothly.
2.
without problems or difficulties :
The interview went smoothly .
3.
in a calm or confident way :
'Would you like to come this way?' he said smoothly.
4.
in a way that produces a smooth surface or mixture :
The colours blend smoothly together.