Harm and danger

insidious
(adj)
in-SID-i-ǝs
Meaning

treacherous; stealthy; sly

1st Sample Sentence

When I heard that he had invited my sister to his house, I thought it sounded like an insidious trick.

Root

in (into, in, on, upon)#sedere (to sit) (Latin)

Mnemonics

insidious= inside+ hideous. think of something terrible, like a disease, hiding inside of the body. Relate it with inside as in "something inside or hidden ". Insidous Remember the sith lord-darth sidious. He was a vile treacherous person. Thus insidious = sly, treacherous

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