Rhinella jimi is a stout and large toad. Adult males measure on average and adult females in snout–vent length. The
holotype, an adult male measures . The
tympanum is distinct. The head has many cranial crests. The
parotoid glands follow the supra-tympanic crests. Males have moderately strong arms, while they are slim in females. The fingers have no webbing. The legs are short and robust. The toes are fringed and have basal webbing. Dorsal skin is covered by many tubercles of different sizes. Males have keratinized spines on the
dorsum, flanks, and upper surfaces of limbs. Preserved specimens are grayish beige above, mottled with dark brown spots. The parotoid glands have a more orangeish tint. The ventrum is lighter beige than in dorsum. The head is very dark, from brown to nearly black. ==Habitat and conservation==