Eucalyptus neglecta is a tree, sometimes a
mallee that typically grows to a height of and forms a
lignotuber. It has smooth grey to brownish bark, but older specimens often have fibrous grey to brown bark on the trunk. The crown of the tree is mostly composed of
sessile, juvenile leaves that are arranged in opposite pairs, with some intermediate and adult leaves. Juvenile leaves are greyish green, broadly elliptic to almost round, up to long and wide. Adult leaves are lance-shaped, the same shade of green on both sides, long and wide on a
petiole up to long. The flower buds are arranged in leaf
axils in groups of between seven and fifteen on an unbranched
peduncle up to long, the individual buds sessile. Mature buds are oval, long and wide with a conical to rounded
operculum. Flowering occurs between November and February and the flowers are white. The fruit is a woody, cup-shaped or conical
capsule long and wide with the valves near rim level. ==Taxonomy and naming==