It has smooth, white or greyish bark, lance-shaped adult leaves, flower buds in groups of seven, nine or eleven, white flowers and conical or hemispherical fruit.Eucalyptus kybeanensis is a mallee that typically grows to a height of 4–6 m (13–20 ft), rarely a tree to 18 m (59 ft), and forms a lignotuber.

Young plants and coppice regrowth have warty stems and glossy green, lance-shaped or curved leaves that are 35–85 mm (1.4–3.3 in) long and 6–16 mm (0.24–0.63 in) wide.

Mature buds are oval to oblong, 4–5 mm (0.16–0.20 in) long and wide with a rounded to flattened operculum.

[2][3][4][5][6] Eucalyptus kybeanensis was first formally described in 1915 by Joseph Maiden and Richard Cambage from a specimen collected by Cambage on 4 November 1908, and that "grew on sandy conglomerate formation at Kybean, amongst Casuarina nana, Sieber, near the Kydra Trigonometrical Station, on the Great Dividing Range, 4,000 feet above sea-level, sixteen miles easterly from Nimitybelle".

[7][8] The specific epithet (kybeanensis) refers to the locality of Kybean in New South Wales.