Kunzea opposita is a spindly shrub which grows to a height of with its young stems covered with fine hairs. The leaves are mostly arranged in opposite pairs along the branches and are narrow egg-shaped, long and less than wide on a very short
petiole. The leaves are
glabrous. The flowers are arranged in rounded groups of five to nine on the ends of the branches. There are lance-shaped to egg-shaped
bracts which are long and wide, and smaller paired
bracteoles at the base the flowers. The
floral cup is long and hairy. The
sepals are triangular to egg-shaped, long and sometimes hairy. The
petals are pink, oblong to broadly egg-shaped, about long and there are 40 to 50
stamens in several rows. The stamens are long. Flowering occurs in August to November and is followed by fruit which an urn-shaped
capsule about long and wide with the sepal lobes attached. ==Taxonomy and naming==