take (someone) for a fool

To presume or believe that someone is very stupid or foolish. I'd advise you not to take her for a fool. She may play dumb, but she's very crafty.

Name	Pronounced	Usage
Eben	-	English
Adelina	[.ædi'li:nə]
Gunnarr	-	Ancient Scandinavian, Norse Mythology
Hed	-	Hebrew
Silvius	-	Late Roman, Roman Mythology
Valko	-	Bulgarian