What does lui non plus mean in English?

Nor can/could/did/does/had/has/is/was/will/would/should/... he.

E.g.

Elle ne va jamais au cinéma, et lui non plus.

She never goes to the cinema, and nor does he.

Je n'étais pas sûr, et lui non plus.

I wasn't sure, and nor was he.

Tu ne seras pas heureuse, et lui non plus.

You won't be happy, and nor will he.

etc.

Also to be seen in constructions like this:

Lui non plus ne va pas bien.

He's not well either.

Lui non plus n'était pas intéressé.

He wasn't interested either.

Lui non plus ne sera jamais président.

He'll never be president either.