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いけねえ

no good; must not

adjective Rare #39,913
no good; must not An informal, rough-sounding form of いけない.
JA: そんなことしちゃいけねえ。
EN: You mustn't do that.

いけねえ

Oops.

— 魔女の宅急便 (1989)

（ポルコ）いけねえ

Oh no.

— 紅の豚 (1992)

そいつはいけねえ

That won't do.

— 七人の侍 (1954)