1. (

• dunce ,
• dunderhead ,
• numskull ,
• blockhead ,
• bonehead ,
• lunkhead ,
• hammerhead ,
• knucklehead ,
• loggerhead ,
• muttonhead ,
• shithead ,
• dumbass ,
• fuckhead

) a stupid person; these words are used to express a low opinion of someone's intelligence ;

2. (

• hammerhead

) the striking part of a hammer ;

3. (

• hammerhead ,
• hammerhead_shark

) medium-sized live-bearing shark with eyes at either end of a flattened hammer-shaped head; worldwide in warm waters; can be dangerous ;