bad
獰 centers on a fierce, untamed badness, like a wild animal's ferocity. It describes something inherently vicious or cruel.
獰 combines the beast radical 犭 with 寧, which likely contributes a phonetic element. The character expresses the idea of a fierce, bad-tempered animal.
A wild beast 犭 combined with a complex shape 寧 suggests something untamed and dangerous. Picture a snarling animal that embodies pure badness.
For ドウ, imagine a fierce dog (like a Doberman) growling: dog -> ドウ, and its bad temper matches the kanji's meaning.