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The phrase "are difficult to classify" is correct and usable in written English.
It can be used when discussing items, concepts, or phenomena that do not easily fit into established categories or classifications.
Example: "The species found in this region are difficult to classify due to their unique characteristics and variations."
Alternatives: "are hard to categorize" or "are challenging to define".
Exact(45)
Biographies are difficult to classify.
Aira's novels are difficult to classify — they're by turns realist, surrealist, absurd, and philosophical.
Tim Fite, from Brooklyn, dabbles in classic acoustic folk and hip-hop, and his scrappy, defiantly lo-fi songs are difficult to classify.
The library was the home of Beatty's personal collection, gathered during the first half of the 20th century, and his wide-ranging tastes are difficult to classify.
(Jon Pareles) TIM FITE (Friday) Mr. Fite, from Brooklyn, dabbles in classic acoustic folk and hip-hop — still an unlikely pairing, although increasingly less so — and his scrappy, defiantly lo-fi songs are difficult to classify.
The linguistic groups and subgroups of the area are difficult to classify with certitude, but the Grusi languages make up a subbranch of the Gur (Voltaic) branch of the Niger-Congo language family.
Similar(14)
In the traditional recognition approach, only one classifier is used; thus, it is difficult to classify all radar emitter signal samples.
Basinski's music is difficult to classify.
Titled Love Remains, it was difficult to classify.
It's difficult to classify Dermansky's work.
Mr. Caymmi (pronounced kah-EE-mee) is difficult to classify.
More suggestions(19)
are difficult to label
are difficult to allocate
are tough to classify
are difficult to categorise
are difficult to drop
are difficult to organize
are difficult to rank
are difficult to call
are difficult to consider
are challenging to classify
are difficult to distinguish
are difficult to develop
are difficult to control
are difficult to discern
are difficult to analyze
are difficult to disentangle
are difficult to target
are difficult to watch
are difficult to obtain
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com