Insidious - insiduous (error)

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The adjective insidious is spelled thus. OED records the erron[eous] spelling insiduous as extant in the 18th and 19th centuries. Alas, it can still be seen in modern students' writing. It is still erron[eous], so don't do it!

It is also wrong to pronounce it as if it were written insiduous 'in-sid-YOU-es'; the word is properly pronounced IPA: /ɪn 'sɪd ɪ əs/.

Etymological note: The word insidious is derived from the Latin insidiae, meaning 'ambush'. Hence it means 'taking one by surprise', 'creeping up unnoticed', or as OED (1900) puts it, "Full of wiles or plots; lying in wait or seeking to entrap or ensnare; proceeding or operating secretly or subtly so as not to excite suspicion; sly, treacherous, deceitful, underhand, artful, cunning, crafty, wily. (Of persons and things.)"