Eucalyptus acies is a straggly
mallee shrub that typically grows to a height of and has smooth grey bark. It usually has several main stems and its young branches are more or less square in cross section. Leaves on young plants are arranged in opposite pairs, elliptic, long and wide with the lower surface a slighter paler green. The adult leaves are thick and coarse, in length with a lanceolate blade. Starting as a blue dullish green the leaves mature to a glossy green. Adult leaves are a similar green on both sides, lance-shaped and long and wide on a flattened
petiole long. The flowers are borne in groups of up to seven in leaf
axils on a flattened
peduncle long. The unopened buds are club-shaped, long and wide including the
pedicel. The
flower cup has prominent ridges and is long and usually much longer than the
operculum. The
stamens are creamy white and all are fertile. Flowering occurs from September to November and the fruit is hemispherical to bell-shaped, long and wide. ==Taxonomy and naming==