Shrub to 3.5 m high, erect, spreading, glabrous, resinous. Branchlets terete, obscurely ribbed, minutely puncticulate. Phyllodes narrowly elliptic, shallowly falcately recurved, 7–10 cm long, 7–10 mm wide, thin, drying brownish, sparsely tuberculate, with numerous subdistant veins; veins 3–6, slightly more pronounced than the intervening venules; anastomoses few or absent; gland 1–2 mm above pulvinus, slightly swollen within lamina; pulvinus c. 1 mm long. Inflorescences simple; peduncles 2–3 mm long; spikes 1.5–3 cm long, narrow, pale yellow to ?cream-coloured. Flowers 5-merous; sepals free. Pods and seeds not seen (see below), recorded as narrow-linear in C.A. Gardner 1369.
Recorded growing between sandstone boulders near a creek, and on a sandstone pavement. In the West Kimberley, Acacia lentiginea appears to be restricted to the higher rainfall zone, and grows around sandstone pavements in fire-protected sites (R.L. Barrett, pers. comm., October 2018).
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