"Matematicienii sunt deștepți."

Translation: Mathematicians are smart.

[Susan62877]

The correct answer is "The mathematicians are smart/clever." Matematicieni would be "Mathematicians"

[Renardo_11]

In Romanian you cannot say “Matematicieni sunt deștepți” without some determination, such as the defining article. So “matematicienii” here can mean (all) mathematicians or the mathematicians*.

[Walt1965]

'bright' is also correct, but marked wrong ...