say it: SMOOTH-lee
smoothly is an adverb meaning "with no problems or difficulties". It carries 2 recorded senses.
with no problems or difficulties
“put the plans into effect quickly and smoothly”
“despite of some mishaps, everything went swimmingly”
in a smooth and diplomatic manner
“`And now,' he said smoothly, `we will continue the conversation'”
Definitions, synonyms and semantic relations for smoothly come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.