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Discover LudwigThe phrase "are erratic" is correct and usable in written English.
It can be used to describe something that is inconsistent, unpredictable, or irregular in behavior or performance.
Example: "The weather patterns in this region are erratic, making it difficult to plan outdoor events."
Alternatives: "are unpredictable" or "are inconsistent."
Dictionary
are erratic
adjective
Unsteady, random; prone to unexpected changes; not consistent
Exact(60)
Our Thanksgivings are erratic.
But oil revenues are erratic.
And traffic patterns are erratic.
In real life, cycles are erratic.
Yet their trade policies are erratic.
Electricity, telephones and the postal service are erratic.
Bobek and Kwiatkowski are erratic long-program skaters.
Both water and electricity supplies are erratic, for a start.
Desserts ($5.50) come from an outside source and are erratic.
Movements are erratic, and the whales seem unsettled, restless, ready to head north.
(Monthly numbers are erratic, which makes it difficult to pin down the growth rate more precisely).
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com