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deleterious (adj.)

1640s, "noxious, poisonous," from Medieval Latin deleterius, from Greek deleterios "noxious," from deleter "destroyer," from deleisthai "to hurt, injure," of which Beekes writes, "the verb is probably non-IE, i.e. Pre-Greek." From 1823 as "mentally or morally hurtful or injurious." Related: Deleteriously; deleteriousness.

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