Meaning: Someone that cannot be relied on or trusted, or that replies evasively:
Be careful with that guy. He is as slippery as an eel, and when you need him most, he will never be there.
That politician is as slippery as an eel: he always lies, and never gets to the point.
Phrase:Avoid somebody or something like the plague
Meaning: Do your best to stay away from somebody or something.
Examples:
I have avoided my neighbours' dog like the plague since it bit me last year.
I avoid Google like the plague because I consider it a big brother, a dictator, an enemy.
