without rational basis

See: capricious
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5 million in 2002 for canceled timber contracts because the National Forest Service had ruled that the logging would disturb spotted-owl habitat based on judgments that were "arbitrary, capricious and without rational basis.
The bulk of such opinions must necessarily be without rational basis, since many of them are concerned with problems admitted by the expert to be still unsolved, while as to the rest it is clear that the training and experience of no average man can qualify him to have any opinion upon them at all.