なれん

can't become, cannot be

→ 成る
verb · potential Rare #38,929
can't become, cannot be A colloquial contraction of なれない.
JA: そんなに簡単には医者にはなれん。
EN: You can't become a doctor that easily.
Conjugation of 成る

汚れた人間は絶対ボッピなれん

A tainted human can never become a Boppi.

— エリート・スクワッド (2007)

役者にはなれん

I could never be an actor.

— さらば、わが愛/覇王別姫 (1993)

今は答える気になれん

I don't feel like answering right now.

— キャッチ・ミー・イフ・ユー・キャン (2002)

ニガー弁護士になれん

A nigger can't become a lawyer.

— マルコムX (1992)