guarded optimism

Translations
осторожный оптимизм
He expressed guarded optimism about the project's success.
Он выразил осторожный оптимизм относительно успеха проекта.
Definitions
A cautious or restrained sense of hopefulness about a situation, acknowledging potential challenges while still holding a positive outlook.
Words
guarded

adjective
сдержанный
optimism

noun
оптимизм