Pimelea filifolia is an erect herb that typically grows to a height of. The leaves are thread-like, long and wide. The flowers are arranged in clusters on a peduncle long surrounded by green and purplish, egg-shapedinvolucral bracts long and wide. The flowers are pale pink or purplish white, each on a pedicel up to long, the floral tube long and the sepals long. Flowering occurs between February and July.