What is the primary meaning of 'Feral'?

• 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।

Hence, the primary meaning of 'Feral' is - Wild.

Example Sentence:
1. He looked at me with a feral grin (= like a wild animal).
2. They led a feral existence.

Source:
1. merriam-webster.
2. Website Lecture.