adverb
modifying a verb, adjective, or other adverb to indicate that something is done excessively or inappropriately
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The judge ruled that the evidence was unduly prejudicial and therefore inadmissible in court.
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I think it's unduly harsh to give him a detention for being late once.
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She was unduly stressed about the exam, but she ended up doing just fine.
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His influence over the group was unduly strong, shaping their decisions in ways they didn't realize.