smooth in WordNet English dictionary

1. smoothly agreeable and courteous with a degree of sophistication
   "he was too politic to quarrel with so important a personage"; "the manager pacified the customer with a smooth apology for the error"
   politic  smooth  suave  bland 
   
2. smooth and unconstrained in movement
   "a long, smooth stride"; "the fluid motion of a cat"; "the liquid grace of a ballerina"
   fluent  fluid  liquid  smooth 
   
3. (music) without breaks between notes; smooth and connected
   "a legato passage"
   legato  smooth 
   
4. (of a body of water) free from disturbance by heavy waves
   "a ribbon of sand between the angry sea and the placid bay"; "the quiet waters of a lagoon"; "a lake of tranquil blue water reflecting a tranquil blue sky"; "a smooth channel crossing"; "scarcely a ripple on the still water"; "unruffled water"
   placid  quiet  still  tranquil  smooth  unruffled 
   
5. having a surface free from roughness or bumps or ridges or irregularities
   "smooth skin"; "a smooth tabletop"; "smooth fabric"; "a smooth road"; "water as smooth as a mirror"
   smooth 
   
6. of the margin of a leaf shape; not broken up into teeth
   smooth 
   
7. of motion that runs or flows or proceeds without jolts or turbulence
   "a smooth ride"
   smooth 
   
8. lacking obstructions or difficulties
   "the bill's path through the legislature was smooth and orderly"
   smooth 
   

1. make (a surface) shine
   "shine the silver, please"; "polish my shoes"
   polish  smooth  smoothen  shine 
   
2. make smooth or smoother, as if by rubbing
   "smooth the surface of the wood"
   smooth  smoothen 
   
3. free from obstructions
   "smooth the way towards peace negotiations"
   smooth  smooth out 
   

1. the act of smoothing
   "he gave his hair a quick smooth"
   smooth