I find the plan to be unsatisfactory in several ways.

He laughed loudly, which behavior seemed inappropriate.

This unexpected malfunctioning of the system was caused by improper wiring.

We're deeply sorry for the inappropriate remark earlier.

They vote in secret, may seek public office, and may demand the removal of public officials who behave improperly.

Among the critics are those who think that the objective set for the European Central Bank is not appropriate.