A slender, active unstreaked warbler with a long graduated tail that is sometimes cocked. It is mouse-brown above and pale below, with tawny flanks and a distinctive pale eyebrow. Pairs and small groups patrol rank grass, riverine scrub, and thickets in savanna, where they are often on the ground or in the lower levels of vegetation. The species sings a strident “stiiikk” note repeatedly 6-15 times before pausing, but it may sing incessantly for minutes, and it also has a tinnier “stip-stip-stip” call; tone and pitch vary geographically. The similar Pale Prinia is more washed out with whitish flanks, and the very similar-looking River Prinia is local, restricted to riverine fringes in the Sahel, and has a sweeter higher-pitched song.