"ever harsher" is correct and usable in written English.
You can use it whenever you are discussing something that is becoming more severe or intense over time. For example: "The punishments for cheating on exams have become ever harsher in recent years."
As it imposes ever harsher budget cuts, Brian Cowen's government can only dread the prospect.
Shakespeare's most famous fool, the Fool in "King Lear," leads the protagonist toward ever harsher simplifications.
But in recent years, many say, they have been handing down ever harsher punishments.
Nothing should be done because nothing can be done, except ever harsher austerity, which will someday, somehow, be rewarded.
On this point they concluded the evidence showed that passing ever harsher sentences did not "enhance the deterrent effect".
The notorious "game laws" were made ever harsher as poaching became a long-running battle between rich and poor.
But Salas explains that, "It is impossible to judge with emotion and to condemn with indignation," since no sentence is ever harsh enough to compensate for a victim's suffering.
Cross-border Palestinian raids, many by Yasser Arafat's new Fatah organisation, prompted ever-harsher Israeli reprisals.
Specifically, demands for ever-harsher austerity, with no offsetting effort to foster growth, have done double damage.
If they are not, Iran will face the certainty of ever-harsher sanctions and the growing possibility of military action.
Yes, it has a prime minster, finally; but the chances of serious economic reform are minimal, the willingness to persist in ever-harsher austerity — which the Rehns of this world tell us is essential — is evaporating.
