1
Stage 1 of 3
sedere
Latin · ancient
"to sit"
to sit, giving rise to insidere (to sit in wait, to lie in ambush)
2
Stage 2 of 3
insidiosus
Latin · ancient
"lying in wait, deceitful"
lying in wait, deceitful, from insidiae (an ambush, from insidere)
3
Stage 3 of 3
insidious
English · 1530s
"proceeding harmfully but gradually or subtly"
settled as the English word for something proceeding harmfully but gradually or subtly
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