פּירוש אויף בראשית 16:12

פרא אדם A WILD MAN — One who loves the open spaces to hunt wild animals, as it is written of him (Genesis 21:20) “And he dwelt in the wilderness and became an archer.”

פרא אדם, an anonymous trader who travels to distant places where he is not known; compare Genesis 37,25 where the Torah describes such a caravan of Ishmael’s descendants to whom Joseph was sold. The word פרא also occurs as the definition of a person in Job 11,12. ועיר פרא יולד, i.e. an infant born and not yet named is a פרא. A person who lacks the intelligence and senses of ordinary people is called there: עיר פרא, “a wild ass;”[I am not sure about the difference between פרא אדם and אדם פרא. What seems clear is that the adjective פרא appears to diminish the degree of צלם אלוקים, Divine image that ordinary people have been equipped with from birth. It may be noteworthy that both Kayin and Hevel when born, the first human beings to have been born by woman, were not described as possessing this Divine image as opposed to Sheth, Chavah’s third son. This may explain a great deal about both of these sons experiencing either premature death, or ongoing tragedy in their lives. Ed.]

‘PERE ADAM.’ Rashi comments: “One who loves the deserts³⁶⁴The word pere is thus, according to Rashi, synonymous with “desert,” as it says peraim bamidbar (Job 24:5). Pere adam is thus: “a man who loves the desert.” (Mizrachi.) [and] to hunt wild animals, as it is written, And he dwelt in the wilderness and became an archer.³⁶⁵Further, 21:20. His hand shall be against every man. This means that he will be a highway man. And every man’s hand against him. Everyone will hate him and attack him.”
The correct interpretation is that pere adam is a construct form, meaning that he will be a wild-ass man accustomed to the wilderness, going forth to his work, seeking for food, devouring all and being devoured by all. The subject pertains to his children who will increase, and they will have wars with all the nations.
Rabbi Abraham ibn Ezra said: “His hand shall be against every man in that he will be victorious at first over all nations, and afterwards, every man’s hand shall be against him, meaning that he will be vanquished in the end. And in the face of all his brethren, who are the sons of Keturah,³⁶⁶Further, 25:1-4. he should dwell, meaning that Ishmael’s children will outnumber those of Keturah.”

ידו בכל HIS HAND SHALL BE AGAINST EVERY ONE — a highwayman.