The Slate-colored Antbird forages in the understory of western Amazonian forest. Males are slaty grey with white dots forming wing bars; females are brown and rufous.
The male is slaty grey, with small white dots on the dusky wing-coverts forming wing bars; its tail is unmarked and blackish. The female has brown upperparts, rufous-brown head and underparts, and rufous wing spots.
It forages in the understory of terra firme forest.
An extinction-risk assessment has not been added yet.