This species has a wide longitudinal dark-bordered brown zone on the dorsum, which becomes narrow and pointed toward the snout and is outlined by narrow light stripes. There is a suprainguinal black stripe bordering the light margins of the dorsal zone in the posterior half of the body. Two shallow suprascapular tubercles are present and are frequently light-colored. The flanks are a contrasting light grayish tan, sometimes with a slight green or reddish wash. The supratympanic fold is conspicuously emphasized in black and followed on the flanks by a large black diagonal stripe. Limbs have moderate to faint brown cross bars; the forearms are reddish brown. The belly is greenish or flesh-colored. Sometimes individuals have scattered dots on the throat and belly and the ventral surface of the thighs (Diaz et al. 2003).
This species is a member of the subgenus Euhyas (Heinicke et al. 2007).
Etymology- The name derives from the Greek word adelos, meaning concealed, in allusion to the secretive habits of this frog, which immediately stops calling when approached (Diaz et al. 2003).