"They look smart."

[PerezMaicol]

why no!? ei urata destepti

[potestasity]

It should be accepted, report it. (unless it was rejected because of the typo)

[IrmaWalter]

How am I supposed to know that it is plural feminin?

[Mapka15]

You don't know, but "Ei arată deștepți" is also accepted :)