"Níl an múinteoir sásta leis na daltaí."

Translation: The teacher is not satisfied with the students.

[AstroVulpes]

This must be why he fights with the parents.

[deactivated user]

Tá mé ag tástáil, Duo!

[Knocksedan]

If you meant "I am trying", Tá mé ag déanamh iarracht might be a better choice.

tástáil means "try" in the sense of "taste" or "sample".

[deactivated user]

GRMA

[Ballygawley]

http://www.teanglann.ie/en/fuaim/s%c3%a1sta

[EchoWilde]

Would "The satisfied teacher is not with the students" not be acceptable?