roundness

(n) the fullness of a tone of voice
- there is a musky roundness to his wordiness
rotundity,
(n) the quality of being round numbers
- he gave us the results in round numbers, but their roundness didn't affect the point he was making
(n) the property possessed by a line or surface that is curved and not angular
(n) the bodily property of being well rounded embonpoint, plumpness,

rotundity embonpoint plumpness

angularity