even-tempered russian

• ро́вный

  smooth, even, flat

  straight, even (in shape)

  even-tempered, steady, calm

• уравнове́шенный

  steady, balanced, even-tempered

• ура́вненный

  equalized, levelled, evened out

  even-tempered, balanced, composed, calm

• выдержаный

  aged, matured, well-seasoned

  self-possessed, composed, even-tempered

  consistent, sustained, coherent (in style)

• уравнове́сившийся

  balanced, composed, even-tempered, stable