'suitable punishment' is correct and usable in written English.
You can use it when referring to either a consequence given to someone for a wrongdoing or describing a type of penalty or action which is considered to be appropriate. For example, "The principal suggested that a suitable punishment for the student's disruptive behaviour would be to temporarily suspend his school privileges."
Italy have a suitable punishment for the goalscoring chance they were denied for which France are rightly punished.
Now they had alternative ideas for suitable punishment.
Vardy inflicted suitable punishment on his England colleague, intercepting and netting from an acute angle.
He is completely unreasonable in what he considers a suitable punishment.
Cooler finishing from Connor Wickham or Jermain Defoe would have meant suitable punishment.
I have yet to think up a suitable punishment for women, but I long ago devised one for men.
Some may argue even those laws, do not establish suitable punishments for bullying.
She said the administration could support new sanctions legislation if Iran doesn't show a new willingness to cooperate, and even offered to work with Congress to develop suitable punishments.
"If, in especially exceptional cases, the death penalty is not suitable (angemessen), punishment of confinement for life in a penitentiary shall be imposed". The agreed statement also contains a translation of §§ 44 and 51 of the German Criminal Code providing for reduction of sentence under circumstances which were deemed applicable to petitioner by the trial court.
In other words, the operation of a merit-based system in which only the brightest people are allowed to go up the ladder must be incorporated with a suitable reward and punishment system as an integral component of a highly transparent but demanding accountability system.
Mr Maringa had been called to give his assessment by Pistorius's defence counsel, but had been assigned by the state, not the defence, to assess what punishment was suitable.
