Eucalyptus subcrenulata is a tree that typically grows to a height of , sometimes a tall, straight tree to , and forms a
lignotuber. It has smooth, pale grey to brown or yellowish bark, often with horizontal black scars. Young plants and
coppice regrowth have stems that are square in cross-section, sometimes with a wing on each corner and
sessile leaves, arranged in opposite pairs. These leaves are egg-shaped to round, glossy green, long and wide with small teeth on the edge. Adult leaves are arranged alternately, lance-shaped to egg-shaped, the same shade of glossy green on both sides, long and wide, tapering at the base to a
petiole long. The edge of the leaves sometimes have small teeth, the veins are at an angle greater than 45° to midrib and the leaves have a strong spicy aroma when crushed. The flower buds are arranged in leaf
axils in groups of three on an unbranched
peduncle long, the individual buds sessile. Mature buds are oval, long and wide with a rounded to beaked
operculum. Flowering occurs from November to May, peaking between January and March, and the flowers are white. The fruit is a sessile, woody, hemispherical to bell-shaped
capsule long and wide with the valves at rim level or slightly above. ==Taxonomy and naming==