smooth

level, flat, plane, even, smooth mean having a surface without bends, curves, or irregularities.

level applies to a horizontal surface that lies on a line parallel with the horizon.

flat applies to a surface devoid of noticeable curvatures, prominences, or depressions.

plane applies to any real or imaginary flat surface in which a straight line between any two points on it lies wholly within that surface.

even applies to a surface that is noticeably flat or level or to a line that is observably straight.

smooth applies especially to a polished surface free of irregularities.

easy, facile, simple, light, effortless, smooth mean not demanding effort or involving difficulty.

easy is applicable either to persons or things imposing tasks or to activity required by such tasks.

facile often adds to easy the connotation of undue haste or shallowness.

simple stresses ease in understanding or dealing with because complication is absent.

light stresses freedom from what is burdensome.

effortless stresses the appearance of ease and usually implies the prior attainment of artistry or expertness.

smooth stresses the absence or removal of all difficulties, hardships, or obstacles.

suave, urbane, diplomatic, bland, smooth, politic mean pleasantly tactful and well-mannered.

suave suggests a specific ability to deal with others easily and without friction.

urbane implies high cultivation and poise coming from wide social experience.

diplomatic stresses an ability to deal with ticklish situations tactfully.

bland emphasizes mildness of manner and absence of irritating qualities.

smooth suggests often a deliberately assumed suavity.

politic implies shrewd as well as tactful and suave handling of people.