his opinion

His opinion was not accepted.

Son opinion n’a pas été acceptée.

I agree with his opinion.

Je suis d’accord avec son opinion.

I thought his opinion was relevant.

Je pensais que son opinion était pertinente.

In his opinion, the plan is far from perfect.

À son avis, le plan est loin d’être parfait.

He still sticks to his opinion.

Il reste toujours campé sur ses positions.

And his opinion means a lot to you, doesn't it?

Et son opinion compte beaucoup pour toi, n’est-ce pas ?

— Whiplash (2014)

I think his opinion is of great importance.

Je pense que son opinion est d’une grande importance.

That's his opinion.

C’est son opinion.

Since he is not an expert, his opinion is no account.

Comme ce n’est pas un expert, son avis ne compte pas.

She didn't ask him for his opinion.

Elle ne lui a pas demandé son avis.