noun
errant - a person or animal that strays or wanders
adjective
errant - straying from the proper course or standards; wandering
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The police were able to track down the errant driver who caused the accident.
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I can't believe I took the wrong turn, I'm such an errant driver.
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That errant kid always seems to be getting into trouble.
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Her thoughts wandered like errant sheep, never staying in one place for long.