1. Lisse. [Dictionnaire médical de l'Académie de Médecine]
2. [adjective] Having a texture that lacks friction. Not rough.
3. [adjective] Without difficulty, problems, or unexpected consequences or incidents.
4. [adjective] Bland; glib.
5. [adjective] Flowing or uttered without check, obstruction, or hesitation; not harsh; fluent.
6. [adjective] (of a person) Suave; sophisticated.
7. [adjective] (of an action) Natural; unconstrained.
8. [adjective] (of a motion) Unbroken.
9. [adjective] (chiefly of water) Placid, calm.
10. [adjective] (of an edge) Lacking projections or indentations; not serrated.
11. [adjective] (of food or drink) Not grainy; having an even texture.
12. [adjective] (of a beverage) Having a pleasantly rounded flavor; neither rough nor astringent.
13. [adjective] (mathematics) (of a function) Having derivatives of all finite orders at all points within the function's domain.
14. [adjective] (math) (of a number) That factors completely into small prime numbers.
15. [adjective] (linguistics) (classical studies) (of a vowel) Lacking marked aspiration.
16. [adjective] (of muscles) (medicine) Involuntary and non-striated.
17. [adverb] Smoothly.
18. [noun] Something that is smooth, or that goes smoothly and easily.
19. [noun] A smoothing action.
20. [noun] A domestic animal having a smooth coat.
21. [noun] A member of an anti-hippie fashion movement in 1970s Britain.
22. [noun] (statistics) The analysis obtained through a smoothing procedure.
23. [verb] To make smooth or even.
24. [verb] To make straightforward.
25. [verb] (statistics) (image processing) (digital audio) To capture important patterns in the data, while leaving out noise.
26. [noun] The act of smoothing; 'he gave his hair a quick smooth'.
27. [verb] Make smooth or smoother, as if by rubbing; 'smooth the surface of the wood'.
28. [verb] Make (a surface) shine; 'shine the silver, please'; 'polish my shoes'.
29. [verb] Free from obstructions; 'smooth the way towards peace negotiations'.
30. [adjective] 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'.
31. [adjective] 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'.
32. [adjective] Of the margin of a leaf shape; not broken up into teeth.
33. [adjective] Smooth and unconstrained in movement; 'a long, smooth stride'; 'the fluid motion of a cat'; 'the liquid grace of a ballerina'.
34. [adjective] (music) without breaks between notes; smooth and connected; 'a legato passage'.
35. [adjective] Of motion that runs or flows or proceeds without jolts or turbulence; 'a smooth ride'.
36. [adjective] Lacking obstructions or difficulties; 'the bill's path through the legislature was smooth and orderly'.
37. [adjective] (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'.
