Insidious and invidious
I've lost a considerable amount of sleep over these two words, not just because they both have nine letters and look almost the same, differing only by a single consonant, but even more so because, while they both signify something bad or undesirable about the way situations unfold or how people behave toward others, they imply the opposite in the manner these odious actions are carried out, but have no obvious clues about their usage.
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