How do you spell Insidious?
Correct spelling
insidious
Remember INSIDIOUS hides inside like an ambush - keep the 'i' after 'd'
Why is insidious spelled this way?
From Latin insidiosus, cunning. INSIDIAE (ambush). Something insidious ambushes from within — harm that advances so gradually you don't notice until it's too late.
Common misspellings of insidious
insideousinsidiusinsiduousinsidous
Example
The insidious effects of sleep deprivation crept up on her over months of working late shifts.