Canh has scored 775 on Unit Study 3

The definition of insidious

2 Definitions of: insidious

1. adjective, stealthy, subtle, cunning, or treacherous
2. adjective, working in a subtle or apparently innocuous way, but nevertheless deadly
3. Show me some examples of this word: insidious
4. Show me the etymology of the word: insidious

Synonyms:	Machiavellian, surreptitious, stealthy, subtle, cunning, designing, smooth, tricky, crooked, sneaking	And more...
Antonyms:	straightforward

From Collins