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The phrase "are difficult to categorize" is correct and usable in written English.
You can use it when discussing items, concepts, or phenomena that do not easily fit into established classifications or categories. Example: "The new species discovered in the rainforest are difficult to categorize due to their unique characteristics."
Exact(10)
Their plots, however, are difficult to categorize.
These paintings are difficult to categorize.
His views are difficult to categorize.
Sources of vocal tremor are difficult to categorize perceptually and acoustically.
She is unlike many of her contemporaries, however, in that her passions, like her life, are difficult to categorize.
In physical terms, major extinctions are difficult to categorize, because they show a surprising range of phenomena.
Similar(50)
Politically, Slim is difficult to categorize.
As conveyances go, the Sparrow, a battery-powered single-passenger electric vehicle, is difficult to categorize.
Because Ms. Lee performed in two radically different styles, her singing was difficult to categorize.
This Maryland outfit is difficult to categorize; its metallic, riff-heavy rock is brainy yet burly.
With 700,000 residents, 75,000 more than a decade ago, the 12th District is difficult to categorize.
More suggestions(18)
are difficult to dismiss
are difficult to rank
are difficult to describe
are difficult to categorise
are difficult to assign
are difficult to sort
are difficult to characterize
are difficult to prevent
are difficult to control
are difficult to obtain
are difficult to watch
are difficult to classify
are difficult to distinguish
are difficult to develop
are difficult to discern
are difficult to disentangle
are difficult to target
are difficult to analyze
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com