Styphelia deformis is a bushy shrub that typically grows to a height of less than, its branchlets more or less glabrous. Its leaves are narrowly egg-shaped, long and wide on a petiole about long. The flowers are arranged on the ends of branches and in upper leaf axils and are sessile with bracteoles long. The sepals are long, the petals white and joined at the base to form a tube about long, the lobes long and softly-hairy inside. Flowering occurs from March to May and is followed by an oblong drupe long.