A small bird of lower montane forest interior. Whitish belly, pale gray head and greenish wing. Pale grayish wash on the chest with faint streaking, offsetting the whitish throat. Actively searches leaves and branches for insects in small groups. Co-occurs at elevations with other scrubwrens including Vogelkop, Pale-billed and Perplexing, but Gray-green has olive rather than warm brown upperparts. Song, a scratchy jumble of notes followed by an up and down “chi-doo! chi-doo! chi-doo!”. Calls, various raspy, nasal notes and chattering.