difficult to appraise

See: intangible
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References in classic literature ?
A universal experience is exactly the sort of thing which is most difficult to appraise justly in a particular instance.
The same concept can be applied to traditional fine arts, like paintings and sculptures, which are notoriously difficult to appraise.
Mr Belokon did not submit claims for compensation of unearned income and reputational harm as it is difficult to appraise and prove these claims.
However, it is much more difficult to appraise effective project management and post-deployment customer support.
Brokers expressed concern that housing prices will increase, making it difficult to appraise property in a changing market.
Today, the movement has a logo and a charter, but beyond these formalities, it is difficult to appraise, having no identified leader or members of note.
Is it more difficult to appraise any one specific sector of the market?
Most services provided by nature are difficult to appraise and sell, Costanza says.
It was difficult to appraise Coventry in the wide sense.
Here, perhaps, a reviewer should acknowledge honestly cultural differences that make a book such as this difficult to appraise impartially, even while this particular Brit.
This kind of festschrift is difficult to appraise in detail, as the contents are on quite disparate topics, and a series of twelve mini-reviews would prove rather tiresome.
It is difficult to appraise fairly an essay collection of this size in the short space allocated.