Koeleria inaequalis is a perennial grass. The culms are tufted, 30–40 cm tall, and glabrous. The leaves are simple and alternate, with delicate, involute blades that are almost capillary and often exceed the panicles, measuring 20–30 cm long. The surfaces are usually glabrous, occasionally scabrous on the upper surfaces. The margins are entire, with parallel veins. The sheaths are 1–2 cm long, striate, and glabrous or hispidulous, with the lower ones being chartaceous. The ligule is about 1 mm long and membranous. Stipules are absent. The flowers are arranged in compact, spikelike, globose panicles that are silvery brown to yellowish brown, measuring 3–6 cm long. The rachis is villous. The spikelets are 1–3-flowered and 6–7 mm long, with a sparsely villous rachilla. The glumes are unequal and translucent except on the nerves. The first glume is narrow, 3–3.7 mm long, 0.3–0.5 mm wide from keel to margin, 1-nerved, and acuminate at the apex. The second glume is 4.5–5 mm long, 0.7–1 mm wide from keel to margin, 3-nerved, and acute at the apex. The lemmas are 4–6 mm long and scaberulous, with a delicate, straight dorsal awn 1–2 mm long borne 0.7–1.5 mm below the minutely bifid apex. The palea is about 3 mm long and glossy, with a scaberulous keel. The flowers have three stamens and a superior ovary. The fruit is a pale brown caryopsis, fusiform, slightly laterally compressed, and 1.6–2 mm long. It is found on open, grassy slopes, steep ridges, and slopes in dry forests between 730–1,000 meters.