The adverb form of the word 'Feral' is -

• Feral (adjective) English Meaning: (of animals) living wild, especially after escaping from life as a pet or on a farm.Bangla Meaning: বন্য; পোষ মানানো যায়নি এমন; মারাত্মক; পাশবিক।Other Forms: Ferally (adverb).Example Sentence: 1. He looked at me with a feral grin (= like a wild animal).2. They led a feral existence.Source:1. Cambridge Dictionary.2. Accessible Dictionary by Bangla Academy.