よくねえ

not good

→ 良い
よく good, fine + ねえ Negative (non-past)
adjective Rare #44,487
not good Very informal, rough contraction of よくない.
JA: 夜更かしは体によくねえ。
EN: Staying up late isn’t good for you.
Forms of 良い

ところがそれが俺には全然居心地がよくねえんだー

But the thing is, I don’t feel comfortable there at all.

— Tampopo (1985)

よくねえわ!

That’s not good at all!

— 君の名は。 (2016)

よくねえわ

That's not good at all.

— 映画 聲の形 (2016)