Eucalyptus infera is a mallee, rarely a tree, that typically grows to a height of and forms a lignotuber. It has smooth, shiny, grey to copper-coloured bark. Young plants and coppice regrowth have glossy green, egg-shaped to more or less round leaves that are long and wide. Adult leaves are broadly lance-shaped to elliptic or egg-shaped, long and wide on a petiole long. The flower buds are arranged in leaf axils in groups of between nine and eighteen on a peduncle long, the individual buds on pedicels long. Mature buds are oval to spindle-shaped, long and wide with a horn-shaped operculum. Flowering occurs between September and November and the flowers are white. The fruit is a woody hemispherical capsule about long and wide with the valves protruding above the rim of the fruit.
