It is a spreading to low-lying shrub with many stems, branchlets that are hairy when young, linear leaves and yellow flowers in groups of up to eighteen on a rachis up to 50 mm (2.0 in) long.

Persoonia subtilis is a spreading to low-lying shrub that typically grows to a height of 15–100 cm (5.9–39.4 in) with many stems, and young branchlets covered with greyish to brownish hairs.

Flowering mainly occurs from November to January and the fruit is a green drupe with purple stripes.

[2][3][4] Persoonia subtilis was first formally described in 1994 by Peter Weston and Lawrie Johnson in the journal Telopea from specimens collected in 1990 near the falls on Mimosa Creek on the Blackdown Tableland.

[4][5] This geebung grows in forest and woodland in the area between the Blackdown Tableland, Carnarvon Range and Barakula in south-eastern Queensland.