"hardly justifiable" is a correct and usable phrase in written English.
You can use it to express doubt or disbelief in the justifiability of something, usually in the context of an argument or opinion. For example, "The government's decision to raise taxes is hardly justifiable given the current economic state of the country."
Thus, it is hardly justifiable to convert arable land from food production to energy cropping.
Not surprisingly, these values have not been determined (even not discussed) in Germany or other countries for different household types, since this is a highly normative decision, hardly justifiable in 'objective' terms.
Contrasting across individuals, firms, or industries operating in different environments is confounded by treating the complexity of innovations as invariant to such nuances; this rigid trajectory is often a feature in much popular discussion on innovation, and is hardly justifiable.
Moreover, the control group was enrolled from the blood donation facility making a blood-based test very convenient because it can be performed very easily in healthy controls in which an endoscopic procedure would be hardly justifiable and perhaps unethical.
Despite the fact that some patients might have been hospitalized due to mitigating circumstances like poor oral intake and weak support systems (which were inadequately documented in the charts), the average length of stay for hospitalized low risk CAP patients (3.5 days) is hardly justifiable for low-risk patients.
Her film will colour efforts to muster support for an adventure in Afghanistan that some consider hardly more justifiable than the war against Saddam.
Large-scale, preventive medical enterprises can hardly be regarded as scientifically sound and ethically justifiable, unless issues of practical feasibility, sustainability and social determinants of health are considered.
But now there is hardly any scrutiny or interrogation of policies, and only terrifying complacency that murdering Muslims is always justifiable.
We can argue that these were perhaps justifiable concerns, except that the obvious solution would have been assimilation, and that was hardly encouraged.
