Variable but plain slender long-tailed canopy warbler-like bird that is essentially bicolored: pale underneath and dark on top, male darker than female. Upperparts vary from black to gray in different parts of the range, and some populations have a buffy wash on the throat. Pairs are resident in the canopy and mid-story of lowland and montane forest, coastal scrub, and broadleaved woodland, especially where there are vines and tangles. Joins mixed-species flocks. Voice a repeated strident “swip-swip-swip…”, or more musical repeated 2-note “chee-rut, chee-rut”.