In a way that is not accurate, right, or true; making a mistake or error.
From in- (not) + correct (from Latin 'corrigere' meaning 'to make straight') + -ly. The structure shows the 'not right' meaning clearly.
The prefix 'in-' becomes 'im-' before p, 'ir-' before r, and 'il-' before l—this sound-rule is so automatic that many English speakers never notice it, but it's one of the most elegant patterns in the language!
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