be all brawn and no brain(s)

To have great power or physical strength but lack mental acuity or intelligence. He may have been a good football player in high school, but he was all brawn and no brains, so he didn't get into any colleges.

Common Names:

Name	Pronounced	Usage
Blue	[blu:]
Geir	-	Norwegian, Icelandic
Wills	[wilz]
Izaro	-	Basque
Crane	[krein]
Ivan	['aivən]